Czech Metrology Institute 
Okružní 31,  638 00 
Brno 
1. ------IND- 2012 0117 CZ- EN- ------ 20120301 --- --- PROJET 
 
The Czech Metrology Institute (CMI), being the competent body for establishing the metrological and 
technical requirements for legal measuring instrume nts and for establishing testing methods for type 
approvals and for verifications of  legal measuring instruments pursuant to Section 14(1) of Act No 
505/1990 Coll. on metrology, as amended, and pursuant to the provisions of Section 172 et seq. of Act 
No 500/2004 Coll., the Rules of Administrative Pro cedure, as amended, initiated on 12 December 
2011, by virtue of office, administrative pro ceedings pursuant to Section 46 of the Rules of 
Administrative Procedure and, on the basis of its information, issues the following: 
 
 
I 
GENERAL MEASURE  
number: 0111-OOP-C025-11 
ref.: 0313/025/11/Pos., 
 
laying down the metrological and techni cal requirements for specified measuring 
instruments, including methods for the t esting and verification of the specified 
measuring instruments: 
‘taximeter measuring assemblies for taxis’  
 
A taximeter measuring assembly is a functional unit in a vehicle comprising a taximeter (or a 
taximeter evaluation unit as the basic element of such measuring assembly). In view of the fact that the 
relevant EU legislation applies to the placing on the market of taximeters and that national legislation 
applies to taximeter measuring assemblies, placing on the market differs in terms of the legislation according to the type of measuring instrument, i.e. for a  
a) taximeter (which forms the basic element of a taximeter measuring assembly of a taxi);  
b) taximeter measuring assembly, which comprises a functional unit in a vehicle. 
In the case of the taximeters under a), the process of  placing on the market and putting into use, 
including the metrological requirements for measuring instruments and their testing, are covered by Government Regulation No 464/2005 Coll. layi ng down technical requirements for measuring 
instruments,
1) as amended (hereinafter referred to as ‘Gove rnment Regulation’). For taximeters, this 
General Measure lays down only metrological and t echnical requirements and testing methods that 
                                                      
1)   Government Regulation No 464/2005 Coll. implementing into Czech legislation Directive 2004/22/EC of the 
European Parliament and of the Council of 31 March 2004 on measuring instruments, as amended.  
 General Measure No 0111-OOP-C025-11 
apply to an initial verification of a taximeter measuring assembly of a taxi as a unit after its installation 
in a vehicle under heading 6 and to subsequent ve rifications under heading 7. Nevertheless, these 
requirements and methods comply with the Government Regulation1) and the relevant requirements of 
OIML R 21 Taximeters2) and harmonised standards. 
In the case of the taximeter measuring assemblies of taxis under b), which are not covered by the 
Government Regulation referred to above, this re gulation lays down both metrological and technical 
requirements and testing methods to be applied during an initial verification under heading 6, and 
metrological and technical requirements and test ing methods to be app lied during subsequent 
verifications under heading 7 that are carried out after entry into service. These activities are not subject to European legislation, but are subject to Act No 505/1990 Coll. on Metrology, as amended 
(hereinafter referred to as ‘Metrology Act’). 
1   Basic concepts 
For the purposes of this General Measure, th e terms and definitions given in the VIM3) and those listed 
below apply: 
1.1   taximeter: instrument intended to measure duration and distance on the basis of a signal 
provided by a measurement transducer and to calculate  and display the fare to be paid based on the 
measured distance and/or duration of hire 
1.2   taximeter measuring assembly:  measurement system installed in a taxi comprising a distance 
measurement transducer and a taxime ter with a memory unit and printer 
1.3   distance measurement transducer: device installed in a taxi that converts the distance to be 
measured into pulses or digital data which are passed to the taximeter  NOTE: For the purposes of this General Measure, th is term shall be considered to be synonymous 
with the term 
signal generator  used in a separate regulation1)  
1.4   Construction of a taximeter 
1.4.1   real-time clock: device incorporated into a taximeter that tracks the current time and date 
1.4.2   taximeter constant k: constant expressed in pulses per kilometre, which represents the number 
of pulses the taximeter must receive in order to corr ectly indicate a distance travelled of one kilometre 
1.4.3   vehicle constant w: number of pulses delivered to the taxi meter, which appears in the connecting 
element after a distance of one kilometre has been travelled; the constant w is expressed in pulses per 
kilometre (km-1)  
1.4.4   interface: electronic, optical, radio or other hardware  or software means of connection that 
enables information to be automatically passed between individual parts or devices or between 
individual software modules 
1.4.5   user interface: interface that enables information to be interchanged between a taximeter user 
and the measuring instrument or its hardware or software components 
1.4.6   protective interface: interface which only allows the intr oduction of data into the taximeter 
processor that cannot lead to the  
– displaying of data and measurement re sults that are not clearly defined; 
                                                      
2)   OIML R 21 Taximeters— publicly available at www.oiml.org 
3)   International Vocabulary of Metrology—Basic and General Concepts and Associated Terms (VIM).  
2 General Measure No 0111-OOP-C025-11 
– displaying of false data or to the storing of incorrect results or primary indications; 
– adjustment of the measuring instrument or change to any adjustment factors 
1.4.7   legally relevant software (SW):  Programs, data, type-specific and device-specific parameters 
that belong to the taximeter, and define or fu lfil functions that are subject to legal control 
1.4.8   software identification (SW): sequence of readable characters of software that is inextricably 
linked to the software (e.g. version number, checksum) 
1.4.9   printing device, printer: device used to produce hardcopies (printouts) of the measurement 
results and the required documents 1.4.10   memory unit: a device, an electronic hardware component  that is used to record and store 
every non-zero daily change in values re lating to the operation of the taxi 
1.5   Calculation methods 
1.5.1   fare increment step: smallest amount of money by which th e fare may be incremented in equal 
steps in the ‘Hired’ operating position 
1.5.2   normal calculation method S (single application of tariff): fare calculation based on 
application of the time tariff below the cross-over speed and application of the distance tariff above the 
cross-over speed 
1.5.3   cross-over speed: speed value determined by division of th e time tariff value by the distance 
tariff value 
1.6   Tariffs 
1.6.1   tariff: set of tariff values that represents a schedule of  charges or rates that will be operative in 
the taximeter in a specified tariff position  1.6.2   tariff value: value from which the taxime ter calculates the fare 
1.6.3   fare:  total monetary amount calculated, indicated a nd displayed as a fare by the taximeter, due 
for a taxi journey based on a fixed initial fee and/or the length and/or the duration of the journey; the 
fare does not include supplementary charges for extra services  
1.6.4  supplementary charge: monetary amount for an extra service, entered on manual command, 
suitably identified, indicated and displayed separately from the fare in the ‘Hired’ and ‘Stopped’ 
positions, with the possibility of adding to the fare  the current total value display—i.e. the fare 
including the supplementary charges, at the end of the journey 
1.7   operating position:  the mode in which a taximeter pe rforms various functions; the operating 
positions are as follows: 
‘FOR HIRE’ (‘Free’) : operating position in which the system is not calculating a fare during 
operation;   
‘HIRED’ (‘Occupied’): operating position in which the taximeter is calculating a fare which is 
based on a possible initial hire fee and/or a tariff for the distance travelled and/or a tariff for the 
duration of the journey;  
‘STOPPED’ (‘To pay’) : operating position in which the fare calculated for the completed journey 
is displayed; a system for calculating the fare  on the basis of time must not be operating; 
‘MEASURE’:  operating position in which the total distance and duration of the journey are 
measured and indicated 
3 General Measure No 0111-OOP-C025-11 
1.8   control record: continuous data file containing an information record of the changes to the 
values of device-specific parameters, of software updates or other activities or events that are legally 
relevant and which may influence the metrological characteristics; every log entry must be marked 
with the time and date 
1.9   operation mode of a taximeter: mode in which the taximeter is  fully operational and performs 
all functions, including security functions 1.10   service mode of a taximeter: mode for updating or confirming the taximeter parameters to be 
held in the memory 
1.11   Indications and errors  
1.11.1   primary indications: indications, signals and symbols designed, or which may be used, to 
display the fare  
1.11.2   totalisation indication: indication mode to display the totalised values, clearly different from 
other values  
2   Metrological requirements 
The metrological requirements of a taximeter measuring system are based on the requirements of the 
Government Regulation,1) using the relevant requirements of OIML R 21 Taximeters2) and the 
applicable European standards. 
A taximeter that is installed in a vehicle as part of a taximeter measuring assembly must meet the 
conformity assessment requirements within the m eaning of the Government Regulation. For a 
taximeter that has been type-approved in accord ance with the Metrology Act, the metrological 
requirements that were crucial to its putting into  use shall be applied during verification, unless 
otherwise provided by the General Measure. 
2.1   Measurement units 
The units of measurement used shall be: 
– time, in seconds, minutes and hours; 
– distance, in metres (m) or kilometres (km); 
– the fare, in the monetary unit as specified in national regulations. 
2.2   Specified operating conditions 
The same specified operating conditions shall apply to  a taximeter measuring assembly as to a taximeter. 
For the Czech Republic, a taximeter measuring assembly as a unit in a vehicle must have an ambient 
operating temperature range of at least –25°C to +55°C. 
2.3   Maximum permissible error 
2.3.1   Maximum permissible error of a taxime ter measuring assembly during verification 
The maximum permissible errors of a taximeter measuring assembly installed in the vehicle shall be: 
a) for the elapsed time: ±0.2 %; 
b) for the distance travelled: ±2 %. 
The difference between the value of the taximeter constant k and the vehicle constant w for the vehicle 
in which the taximeter is installed must be close to zero. 
4 General Measure No 0111-OOP-C025-11 
2.3.2   Maximum permissible error of a taximeter measuring assembly in operation 
The maximum permissible error of a taximeter measuring assembly in operation must be the same as 
at verification after installation in the vehicle. 
2.4   Taximeter constant k  
It must be possible to display the constant k on the taximeter as a suitable number. 
2.5   Real-time counter 
A real-time counter (clock) must measu re time with an accuracy of ±0.02  %. 
3   Technical requirements 
The technical requirements of a taximeter measuring system are based on the requirements of the 
Government Regulation, using the relevant requirements of OIML R 21 Taximeters and the applicable European standards. 
A taximeter that is installed in a vehicle as part of a taximeter measuring assembly must meet the 
requirements for conformity assessment within the meaning of the Government Regulation. For a 
taximeter that has been type-approved in accordance with the Metrology Act, the technical 
requirements that were crucial to its putting into  use shall be applied during verification, unless 
otherwise provided by the General Measure. 
3.1   General 
A taximeter measuring assembly must calculate the distance travelled and measure the duration of a 
journey in such a manner that, in the ‘Hired’ opera ting position, it calculates and displays the fare for 
certain increments, and in the ‘Stopped’ operating pos ition, it displays the final amount for the journey 
made. 
After the completion of the journey, a printer mu st automatically print an undamaged and legible 
document showing the fare amount and the require d information on the journey made must be 
properly stored in the totalisation memory of the taximeter and the memory unit. 
The basic components of every taximeter measuring assembly shall be: 
– a distance measurement transducer; 
– a taximeter or taximeter in a configuration with a printer and a memory unit; 
– a printer; 
– a memory unit; 
– software or an interface for data transmission. 
3.2   Distance measurement transducers The principle of operation and design of a distance measurement transducer depends on the design of 
the vehicle in which the taximeter measuring assembly has been installed, and must be compatible 
with the taximeter measuring assembly. The operation of a distance measurement transducer and its means of connection to the taximeter must ensure stable transmission and correct information on the 
distance travelled by the vehicle. 
3.3   Taximeter 
3.3.1   Compatibility with other components of a taximeter measuring assembly 
The compatibility requirements for a taximeter with  a distance measurement transducer shall be 
specified by the manufacturer of the taximeter. 
5 General Measure No 0111-OOP-C025-11 
Compatibility with other components of a taximeter measuring assembly must be such that the 
required functioning is ensured. 
For the purposes of testing after installation, a taxime ter shall be equipped so that it is possible to test 
the accuracy of time and distance measurements and the accuracy of fare calculations independently. 
3.3.2   Data provided by a taximeter 
A taximeter must, through a secured interface, provide the following data: 
a) data on the operating position: ‘For Hire’, ‘Hired’, ‘Stopped’ or ‘Measure’; 
b) the totalised data referred to in section 3.3.4; 
c) general information: taximeter constant, security  data, vehicle identification, current time, 
tariff identification; 
d) fare information: total calculated price, fare, calculation of fare, suppl ementary charge, date, 
start time of journey, end time of journey, distance travelled; 
e) tariff information: tariff sub-items. 
The values of the distance travelled and elapsed ti me displayed or provided through an interface must 
use the following units: 
a) distance travelled: kilometres; 
b) elapsed time: seconds, minutes or hours according to need; the necessary resolution and clarity 
of data must be taken into account, however. 
3.3.3   Setting the functions of a taximeter  A taximeter measuring assembly of a vehicle must be  set in accordance with the following principles:  
a) it is not possible to change a tariff in the ‘Stopped’ operating position;  
b) setting a taximeter must not enable a direct sw itch from the ‘Stopped’ operating position to the 
‘Hired’ operating position; 
NOTE—The reason for the above is the fulfilm ent of the requirement for the automatic 
printing of a fare payment document pursuant to section 3.3.7.2. 
c) automatic switching from the ‘Stopped’ operating position when the vehicle is moving to the 
‘For Hire’ operating position shall only be possible  
– after a period of longer than 10 seconds, or 
– after a distance of 200 m has been travelled (setting the value of the ‘distance in the 
Stopped position’) 
depending on which happens first; any printing of  a fare payment document pursuant to the 
provisions of section 3.3.7.2 must be allowed to finish; 
d) the set value of the taximeter functions ‘initial distance’ and ‘initial time’ must equal zero or 
must be disabled.  
3.3.4   Totaliser of a taximeter 
A taximeter must be equipped with a non-resett able totaliser for all of the following values: 
a) total distance travelled by the vehicle; 
b) total distance travelled when hired; 
c) total number of journeys; 
d) total amount of money paid as supplements; 
6 General Measure No 0111-OOP-C025-11 
e) total amount of money paid as fares. 
The totalised values must also contain data on a jo urney, the recording of which was disturbed as a 
result of disconnection from, or a decrease in the voltage of, the source. 
If a taximeter is disconnected from the source, it must be possible for the totalised values to be stored 
for a period of at least one year and to be tr ansferred from the taximeter to another medium. 
3.3.5   Calculation of fares by a taximeter  
In the Czech Republic, fare calculations are performed only by the single calculation system S 
(verification of the taximeter measuring assembly of a taxi with switching to the double calculation 
system D is not permitted). 
This provision shall not apply to verification if  otherwise provided by a binding decision of a 
competent body and notified to the CMI, within the scope of the decision. 
The symbol of the payment currency must conform to  the requirements of the regulations in force in 
the Czech Republic. 
3.3.6   Indication of a taximeter  
The indications on a display must be reliable, easy  and unambiguous under the conditions of normal 
use during the day and at night. A taximeter display must be freely visible from the front passenger 
seat and from the rear seats of the vehicle. 
Primary indications must include the names and symbols of the measurement units. 
3.3.7   Printing  3.3.7.1   General 
A taximeter printer is an integral part of a taxi meter measuring assembly and must ensure the printing 
of an undamaged and legible document with the minimum data pursuant to section 3.3.4. 
The legal regulations of the Czech Republic require that the software installed in a taximeter allows 
the printing of documents showing the fare amount and other information, and the printing of vehicle 
operation records, or the printing of the content of totalisers and memory units, or the printing of the 
set parameters of the taximeter, etc.  
3.3.7.2   Printing of fare amount documents 
A fare amount document must, pursuant to the requirements of  legal regulations,
4) include at least the 
following information: 
a) the document number; 
b) the business name or name of the legal person,  or business name or name and surname or 
other identification features of the natural person; 
c) the identification number of the taxi service operator, if assigned; 
d) the number plate of the taxi; 
e) the registered number of the taxi; 
f) the serial number of the taximeter and memory unit; 
g) the date of the journey; 
h) the origin and destination of the journey; 
                                                      
4)   Regulation No 478/2000 Coll. of the Ministry of Transport and Communications implementing the Road 
Transport Act, as amended. 
7 General Measure No 0111-OOP-C025-11 
i) the time of departure and arrival; 
j) the number of the tariff used, including all sub-items comprising the resulting tariff; 
k) the distance travelled in kilometres; 
l) the price of the service provided; 
m) the name and surname of the driver; 
n) the driver’s signature. 
The printer must print the fare payment document automatically and immediately after the completion 
of each journey (immediately after the operating position of the taximeter switches from ‘Hired’ to 
‘Stopped’) using the data provided by the taximeter through the relevant interface. 
The data referred to in points h) and n) shall be entered by hand. 
3.3.7.3   Printing of monthly totals document 
A monthly totals document must, pursuant to the requirements of legal regulations,4) include at least the 
following information: 
a) the business name or name, if the taxi service ope rator is a legal person, or business name or 
name and surname or other identification features if the taxi service operator is a natural 
person; 
b) the identification number of the taxi service operator, if assigned; 
c) the number plate of the taxi; 
d) the registered number of the taxi; 
e) the serial number of the memory unit; 
f) the serial number of the taximeter;  
g) the name, surname and year of birth of the driver and driver number, if assigned by the taxi service 
operator; 
h) the month and year for which the totals are drawn up; 
i) the signature of the taxi service operator; 
j) the total number of kilometres travelled while  performing a taxi service since the previous 
monthly total, including its breakdown into individual days of the month; 
k) the total number of paid kilometres trave lled while performing a taxi service since the 
previous monthly total, including its brea kdown into individual days of the month; 
l) the total fares since the previous monthly total,  including its breakdown into individual days of 
the month; 
m) the total number of kilometres travelled in private operation since the previous monthly total, including its breakdown into individual days of the month; 
n) the total number of paid journeys since the previous monthly total, including its breakdown 
into individual days of the month. 
3.4   Memory units 
3.4.1   General 
8 General Measure No 0111-OOP-C025-11 
A memory unit is an integral part of a taximeter measuring assembly5) and must record and store every 
non-zero daily change in values relating to the operation of the taxi that are necessary in particular for 
the printing of monthly totals and every intervention in the programming of the taximeter.  
It must be possible to obtain (read) data from a me mory unit without disrupting any security protection 
(official mark) by data transmission through a standard interface.  It must be impossible to store (record) in the memory unit any data coming through any interface 
outside the taximeter measuring assembly other than an initial one-off recording (see section 3.4.2.1). 
3.4.2   Means of recording data and values 
The design of a memory unit must permit only recordi ng and the subsequent reading of stored data, for 
a period of at least five years from the date of recording. The software of a taximeter measuring 
assembly must ensure that, when printing the documen t pursuant to section 3.3.7.2, the data and values 
referred to in sections 3.4.2.1 and 3.4.2.2 ar e always printed only from the memory unit. 
Not later than 60 daily records prior to filling of th e recording capacity of a memory unit, information 
on the remaining free capacity must be provided at the time of printing any totals document (daily, 
monthly or partial); in the event of the complete filling of a memory unit, the taximeter must block the taximeter measuring assembly. Restoration of its operation shall only be possible after the existing memory unit has been replaced by a new unit.  
3.4.2.1   Initial one-off recording 
A one-off recording of the data referred to in section 3.3.7.3 a), b), e) and f) shall be made upon the 
first activation of a memory unit in a vehicle. Such  data cannot then be edite d or supplemented in the 
memory unit. In the case of a change to the data, it shall be necessary to activate a new memory unit. 
3.4.2.2   Continuous records 
The data (values) referred to in section 3.3.7.3 j)  to n) shall be recorded simultaneously once per 
calendar day; the date (day, month, year) mu st be added (recorded) to each such record. 
All interventions in the programming of the taximeter that are legally relevant and that may affect the 
metrological parameters shall be recorded and the date (day, month, year) shall be added; the 
taximeter measuring assembly software must enable such information to be displayed (printed). 
3.5   Interfaces 
3.5.1   General 
The individual elements of a taximeter measuring assembly shall be connected to a taximeter interface 
(to taximeter interfaces), the functions of which must  comply with the general integrity requirements 
of the particular assembly, and which must be equippe d with the functions required by this regulation. 
In the event of the disconnection or malfunctioning of any individual element of the assembly, it must 
be possible to withdraw the taximeter from ser vice automatically by making an adjustment. 
3.5.2   Information on the interfaces supplied with an instrument 
The following information on a taximeter or the control element of a taximeter measuring assembly 
must be provided that applies to the taximeter or assembly: 
a) a description of the interface and its identification (e.g. RS 232, USB, interface number or 
marking, etc.); 
                                                     
 
5)   Road Transport Act No 111/1994 Coll., as amended. 
9 General Measure No 0111-OOP-C025-11 
b) a summary of all commands (i.e. menu items re ceived through the communications interface 
in the case of a user interface or in the case of commands accepted by the software of the 
device); 
c) a brief description of the significance of the interfaces and their effect on the functionality and 
data of the taximeter measuring assembly; 
d) other relevant information relating to the characteristics of the taximeter interface.  
3.5.3   Interface security 
An interface must be constructed in such a manner th at the metrological functions of the taximeter, its 
legally relevant software and the measured data  cannot be unduly affected by other mutually-
connected instruments or by disturbances acting on the interface. 
3.6   Software 
3.6.1   General 
Software that is crucial for metrological character istics, measured data and important metrological 
parameters (applicable also to the setting of indivi dual tariffs) and used for storage, transmission and 
the detection of system faults shall be considered to  be an essential part of a taximeter and therefore of 
its measuring assembly. Such legally relevant software  must be marked by the manufacturer and must 
be secured. 
A taximeter of a measuring assembly must enable the easy identification of such software or software 
version; this identification shall always be adjusted with every change to the legal part of the software. 
This software must be identifiable using a checksu m or by another software means (e.g. the hash 
function), enabling the authenticity and validity of t hose parts of the software that are crucial for 
metrological characteristics, measured data and importa nt metrological parameters to be controlled. A 
checksum should be of a length that permits it to be displayed on the taximeter or printed by the 
taximeter’s printer. The checksum must be calculated by the taximeter immediately prior to its display 
or printing. 
3.6.2   Information on the software supplied with a taximeter 
The manufacturer or his authorised representativ e must provide the following information on the 
software controlling a taximeter within a taximete r measuring assembly that is applied pursuant to 
national legislation: 
a) a description of the legally relevant software; 
b) a description of the accuracy of the measuring algorithm (i.e. the rounding algorithm for 
calculations of distance or price); 
c) a description of the user interface, menus and dialogues; 
d) a unique identification of the software version, including checksums; 
e) an overview of the software system; 
f) the means of securing the software; 
g) the operating manual; 
h) other information relevant to the software characteristics of the taximeter. 
3.6.3   Identification of legally relevant taximeter software  
In the case of taximeter measuring assemblies that were type-approved befo re 30 October 2006, the 
part of the taximeter software that is specified in detail in section 3.6.1 must be modified so that it 
meets the general requirements for the simple identifi cation of the legally relevant software parts.  
10 General Measure No 0111-OOP-C025-11 
Fulfilment of this requirement shall be proved by  the fulfilment of the requirements pursuant to 
section 3.6.2.  
The effectiveness of section 3.6.3 shall be deferred for a period of 12 months from the date of entry 
into effect this General Measure. 
3.6.4   Securing the legal part of taximeter software 
The legally relevant part of the software of a ta ximeter must be adequately secured against accidental 
or intentional changes by means of suitable protection. 
3.6.5   Data storage 
3.6.5.1   If legally relevant data are stored in a taxi meter memory or on external storage for subsequent 
use, they shall be adequately protected against in tentional and unintentional changes during the storage 
and data transmission process. 
3.6.5.2   A taximeter of a taximeter measuring assembly, including a taximeter that was type-approved 
before 30 October 2006, must automatically ensure that the taximeter functions if its supply voltage 
drops to a value below its lower operating limit (below 9 V DC) as follows: 
a) if the voltage drop is temporary (i.e. less than 20 seconds, for example when starting the 
engine) the taximeter must shall continue to  function correctly or resume its correct 
functioning without the loss of data genera ted before the drop in the supply voltage;  
b) if the voltage drop lasts 20 seconds or more, the taximeter may interrupt its measurements 
(activities); when the power is resumed, the taxi meter shall return, via the ‘Stopped’ operating 
position, to the ‘For Hire’ operating position. While in the ‘Stopped’ operating position, the 
taximeter of the measuring assembly shall start the automatic printing of a printout of the activities performed before the interruption to the correct functioning due to the power loss (drop); in this case, the date and time of the inte rruption to the measurements (activities) of the 
taximeter of the measuring assembly shall be the date and time of the completion of the journey. The taximeter shall also ensure that the data from the current journey are stored in the 
relevant totalisation registers and memory unit.  The data on the interrupted journey shall be 
added to the date of the start of the journey in the memory unit.  
3.6.5.3   The effectiveness of section 3.6.5.2 shall be de ferred for a period of 12 months from the date 
of entry into effect this General Measure. 
3.7   Resistance of a taximeter measuring assembly to external influences 
A taximeter that is installed in a vehicle as part of a taximeter measuring assembly must meet the 
conformity assessment requirements within the m eaning of the Government Regulation. For a 
taximeter that has been type-approved in accord ance with the Metrology Act, the metrological 
requirements that were crucial to its putting into  use shall be applied during verification, unless 
otherwise provided by the General Measure. 
External disturbances acting on a taximeter measuri ng assembly must not lead to measurement errors 
that would exceed the maximum permissible error of  the taximeter pursuant to section 2.3, or the 
measuring assembly must react in accordance with the requirements for resistance to such influences 
laid down for the conformity assessment of ty pe approval of the taximeter itself.  
3.8   Protection against unauthorised manipulation 
3.8.1   The means for securing integrity and settings ava ilable in the taximeter must be such that 
individual settings can be secured separately. 
11 General Measure No 0111-OOP-C025-11 
3.8.2   The general basic requirement relating to prot ection against fraudulent use must be fulfilled in 
such a manner that the interests of the customer, the dr iver of the vehicle, the employer of the driver of 
the vehicle and the financial authorities are protected. 
3.8.3    Appropriate measures must be taken to prevent the use of the indication equipment with 
totalised values to deceive the customer. 3.8.4   Because the properties of a vehicle are of fundamental importance for the correct functioning of 
the taximeter, the taximeter must contain means for securing the connection of the taximeter to the 
vehicle in which it is installed.  
3.9   Installation 
3.9.1   General 
A taximeter measuring assembly and its installation instructions provided by the manufacturer must be 
such that, if the assembly is installed in accordance with the manufacturer’s instructions, there is 
sufficient protection against the carrying out of unauthorised changes to the distance measurement 
transducer signal. 
3.9.2   Operation of a taximeter measuring assembly 
After installation, a taximeter measuring assembly must  comply with the requirements pursuant to this 
regulation. 
All settings that may affect compliance with this regulation must be secured with access only through 
a special secured mode, i.e. the service mode. Other settings that are not subject to legal control must 
have appropriately secure access through the operating mode. 
4   Signs and markings 
4.1   Markings on the measuring instrument 
The individual elements of a taximeter measuring assembly must bear the following descriptions and 
markings: 
– the name or identification mark of manufacturer; 
– the name or identification mark of the importer (if applicable); 
– the specification of the type and serial number of the taximeter, serial number of the memory 
unit and printer (if applicable); 
– the specification marking of conformity or type approval of the taximeter; 
– relevant data in respect of the conditions of use; 
– the year of manufacture; 
– the specified range of the taximeter constant k in pulses per kilometre (alternatively, it is 
permissible to display a specific set value of k electronically); 
– the software identification (may be displayed electronically). 
4.2   Official marks 
Verification must be confirmed by an official  mark that conforms to the Metrology Act. 
After each subsequent verification, a current official mark must be placed on all sealed areas.  
12 General Measure No 0111-OOP-C025-11 
4.3   Location of official marks 
A place shall be provided for the application of official marks. This place must: 
– be such that the part on which an official  mark is located cannot be removed from the 
taximeter measuring assembly without damaging the mark; 
– permit the manipulation necessary during use and maintenance that does not alter the 
properties that are crucial for the verification of the taximeter measuring assembly without 
damaging the official mark. 
When placing official marks, the design and connection of the taximeter measuring assembly must furthermore prevent access to the internal equipment of the taximeter and access to the legal parts of 
the taximeter software (e.g. the constant 
k, tariffs, the measuring and calculation parts) and must 
ensure the integrity of the taximeter measuring assembly as a unit. 
The specific method of securing shall be set out in the conformity certificate of the taximeter and/or in 
the test certificate of the measuring assembly.  
5   Type approval of measuring instruments 
Taximeters that are intended for installation in a vehicle as part of a taximeter measuring assembly shall be placed on the market and put into u se with a conformity assessment pursuant to the 
Government Regulation.
1) For taximeters that have been type-approved in accordance with the 
Metrology Act, the metrological requirements that were  crucial to its putting into use shall be applied 
during verification, unless otherwise provided by the General Measure. 
Taximeter measuring assemblies are not subject to type approval within the meaning of Act No 
505/1990 Coll. on metrology, as amended. 
6   Initial verification 
6.1   General  
Initial verification of a taximeter measuring assembly shall be carried out after its installation in a 
vehicle by an authorised entity or after the replaceme nt and/or repair of a co mponent of the measuring 
assembly in the vehicle by  an authorised entity. 
The following shall be carried out during an initial verification of a taximeter measuring assembly: 
a) a visual inspection; 
b) a test of the accuracy of the taximeter measuring assembly.  
6.2   Visual inspections 
During a visual inspection of a taximeter measuring assembly that has been submitted for verification, 
the following shall be assessed: 
a) the validity of the conformity assessment of the taximeter or conformity of the taximeter with 
the approved type; 
b) the compatibility of the individual component s of the taximeter me asuring assembly according 
to the technical documentation of the measuring assembly during the initial verification after installation or repair; 
c) that the individual parts of the taximeter measuring assembly are not damaged and are functional; 
d) that an approved software version is installed in the taximeter and that its checksum matches;  
e) the fulfilment of the requirements of section 3.6.5.2 for the modification of the software of a taximeter that was type-appr oved before 30 October 2006; 
13 General Measure No 0111-OOP-C025-11 
f) that the settings of the individual optional func tions of the taximeter measuring assembly are 
in accordance with this regulation; 
g) that the settings of the individual tariff prices are in accordance with the legally binding local 
regulations for taxi services (where specified). 
Fulfilment of the requirements under point e) shall, for the purposes of verification, be proved by the 
submission of a declaration by the manufacturer or registered repairer. 
6.3   Function tests 
6.3.1   General 
A function test of a taximeter measuring assembly sh all be carried out only after its installation in the 
vehicle by a competent entity, the setting of the conformity of the taximeter constant with the vehicle 
constant, and the setting of the other optional functions. 
6.3.2   Function tests of accuracy in measur ing time and distance for a taximeter measuring 
assembly in a vehicle as a unit  
The test may be performed using a calibrated manual electronic stopwatch with a maximum 
permissible error for the measurement of time of ±0.1 s and a measured test track with a maximum 
permissible error of ±0.1  % of the measured section. 
6.3.2.1   Function tests of accuracy in measuring time (elapsed time):  
With any selected taximeter measuring assembly tariff and with the taxi at rest, the timer of a standard 
stopwatch shall be started at the same time as the first change of fare by the fare increment after 
switching the taximeter from the ‘For Hire’ operati ng position to the ‘Hired’ operating position. At the 
moment the taximeter indicator displays the amount  corresponding to an elapsed time of 10 minutes, 
the timer on the standard stopwatch shall be stopped. 
The observed deviation in the accuracy of the time me asurement shall be recorded and must be less 
than ±1.2 s (see 2.3.1 a)). 
6.3.2.2   Function tests of accuracy in measuring distance:  
The taxi shall be halted at the start of the measured section, which must be a minimum of 1,000 m in 
length. With any selected taximeter measuring assembly  tariff, the taximeter shall be switched from 
the ‘For Hire’ operating position to the ‘Hired’ operating position, and at the same time, the vehicle 
shall be set in motion on the test track. The speed of the vehicle outside the minimum time for 
acceleration up to speed and the minimum time needed to stop the vehicle must be greater than the cross-over speed corresponding to the selected tari ff. At the moment of the increment where the 
taximeter indicator displays the amount corresponding to the distance of the measured section travelled, the vehicle shall be halted and, at the same time, the taximeter shall be switched from the 
‘Hired’ operating position to the ‘Stopped’ operating position.  
Subsequently, the taximeter of the measuring assembly  must automatically start printing a printout 
showing that the test has been performed and, at the same time, that the taximeter measuring assembly 
fulfils the required function of automatic printing of printouts. 
The observed discrepancy between the specified le ngth of the measured section and the distance 
measured by the taximeter must be less than ±2
 % (see 2.3.1 b)). 
6.3.3   Function tests of accuracy in measur ing time and distance for a taximeter measuring 
assembly in a vehicle as a unit, using a test connector 
Function tests of accuracy in measuring time and distance may be carried using a test connector of the 
taximeter of a measuring assembly (if the requirement s are met for its use pursuant to the requirements 
of OIML R 21 Taximeters) and a calibrated pulse c ounter or calibrated time base, or using the 
14 General Measure No 0111-OOP-C025-11 
appropriate special test equipment with the require d measurement functions, wh ich are calibrated, and 
a straight test track. 
The means of carrying out a test and the length of a test track must fulfil the condition that the overall 
expanded uncertainty of the determination of the accuracy of measurement of time and distance of a 
taximeter measuring assembly installed in a vehicle is less than 1/5 of the maximum permissible error during verification (see 2.3.1). 
7   Subsequent verification 
All taximeter measuring assemblies are subject to sub sequent verification. In a subsequent verification 
of a taximeter measuring assembly, the tests refe rred to under heading 6 shall be carried out. 
8   Notified standards 
The CMI shall, for the purposes of specifying metrological and technical requirements for measuring instruments and for the purposes of specifying testing methods for type approvals and verifications stemming from this General Measure, provide notif ication of Czech technical standards, other 
technical standards or technical documents of intern ational or foreign organisations, or other technical 
documents containing detailed technical requirements (h ereinafter referred to as ‘notified standards’). 
A list of these notified standards with their assignment  to the applicable measures shall be notified by 
the CMI, together with the General Measure, in a publicly accessible manner (on the website 
www.cmi.cz). 
Compliance with the notified standards or parts thereof shall be considered, within the scope and 
under the conditions set out in the General Measure, to be compliance with the requirements laid down 
in such measures to which the st andards or parts thereof relate. 
 
 
15 General Measure No 0111-OOP-C025-11 
16 II 
SUBSTANTIATION   
The CMI issues this General Measure laying down the metrological and technical requirements for 
legal measuring instruments and testing methods fo r type approvals and for verifications of legal 
measuring instruments, implementing Section 24c  of Act No 505/1990 Coll. on metrology, as 
amended. 
Regulation No 345/2002 Coll. specifying measuring instruments that are subject to mandatory 
verification and type a pproval, as amended, includes taximete r measuring assemblies of taxis among 
the measuring instruments that are subject to verifi cation in item 1.1.5 of the annex ‘List of Legal 
Measuring Instruments’. 
In respect of the specific measuring instrument type ‘taximeter measuring assemblies of taxis’, the 
CMI therefore issues this General Measure laying down the metrological and technical requirements 
for legal measuring instruments and testing methods for type approvals and for verifications of legal 
measuring instruments, implementing Section 24c  of Act No 505/1990 Coll. on metrology, as 
amended. 
This regulation (General Measure) has been notif ied in accordance with Directive 98/34/EC of the 
European Parliament and of the Council of 22 June 1998 laying down a procedure for the provision of 
information in the field of technical standards a nd regulations and of rules on Information Society 
services, as amended by Directive 98/48/EC. 
 
III 
NOTICE  
No legal remedy may be sought against this  General Measure (Section 173(2) of Act No 
500/2004 Coll., Rules of Administrative Procedure, as amended). Under to the provisions of Section 172(5) of the Ru les of Administrative Procedure, no appeal may be 
lodged against decisions on objections. The conformity of the General Measure with legal regulations may be assessed in review proceedings 
under the provisions of Sections 94 to 96 of the Rules of Administrative Procedure. A party may 
submit a petition for review proceedings to the admi nistrative body that issued this General Measure. 
If the administrative body finds no grounds for in itiating review proceedings, it shall notify the 
petitioner of this fact, stating reasons, within thirty  days. A resolution to initiate review proceedings 
may, pursuant to the provisions of Section 174(2) of the Rules of Administrative Procedure, be issued 
within three years of the entry in to effect of the General Measure. 
 
IV 
ENTRY INTO FORCE 
This General Measure shall enter into force on the fifteenth day after the date of its publication 
(Section 24d of Act No 505/1990 Coll. on metrology, as amended). 
 
  ...………………………….............. 
 RNDr. Pavel Klenovský 
  general director