Only the original UN/ECE texts have legal effect under international public law. The status and date of entry into force of this Regulation should be checked in the latest version of the UN/ECE status document TRANS/WP.29/343, available at:

http://www.unece.org/trans/main/wp29/wp29wgs/wp29gen/wp29fdocstts.html

Regulation No 125 of the Economic Commission for Europe of the United Nations (UN/ECE) — Uniform provisions concerning the approval of motor vehicles with regard to the forward field of vision of the motor vehicle driver

Incorporating all valid text up to:

Supplement 1 to the original version of the Regulation — Date of entry into force: 3 February 2008

Supplement 2 to the original version of the Regulation — Date of entry into force: 19 August 2010

CONTENTS

REGULATION

ANNEXES

1. SCOPE AND PURPOSE

This Regulation applies to the 180° forward field of vision of drivers of category M1 vehicles (1) .

Its purpose is to ensure an adequate field of vision when the windscreen and other glazed surfaces are dry and clean.

The requirements of this Regulation are so worded as to apply to category M1 vehicles in which the driver is on the left. In category M1 vehicles in which the driver is on the right these requirements shall be applied by inverting the criteria, when appropriate.

2. DEFINITIONS

For the purposes of this Regulation:

‘Approval of a vehicle type’ means the full procedure whereby a Contracting Party to the Agreement certifies that a vehicle type meets the technical requirements of this Regulation;

the shape and dimensions of the windscreen and its mounting;

the external and internal forms and arrangements within the area specified in paragraph 1 which may affect visibility; and

‘Vehicle type with regard to the field of vision’ means vehicles which do not differ in such essential aspects as:

Vehicles fitted with suspension enabling their ground clearance to be adjusted shall be tested under the normal conditions of use specified by the vehicle manufacturer.

‘Three-dimensional reference grid’ means a reference system which consists of a vertical longitudinal plane X-Z, a horizontal plane X-Y and a vertical transverse plane Y-Z (see Annex 4, appendix, figure 6); the grid is used to determine the dimensional relationships between the position of design points on drawings and their positions on the actual vehicle. The procedure for situating the vehicle relative to the grid is specified in Annex 4; all coordinates referred to ground zero shall be based on a vehicle in running order (2) plus one front-seat passenger, the mass of the passenger being 75 kg ±1 per cent.

‘Primary reference marks’ means holes, surfaces, marks and identification signs on the vehicle body. The type of reference mark used and the position of each mark relative to the X, Y and Z coordinates of the three-dimensional reference grid and to a design ground plane shall be specified by the vehicle manufacturer. These marks may be the control points used for body-assembly purposes.

‘V points’ means points whose position in the passenger compartment is determined as a function of vertical longitudinal planes passing through the centres of the outermost designated seating positions on the front seat and in relation to the ‘R’ point and the design angle of the seat-back, which points are used for verifying compliance with the field of vision requirements.

‘Windscreen datum points’ means points situated at the intersection with the windscreen of lines radiating forward from the V points to the outer surface of the windscreen.

‘Transparent area’ means that area of a vehicle windscreen or other glazed surface whose light transmittance measured at right angles to the surface is not less than 70 per cent. In the case of armoured vehicles the light transmittance factor is not less than 60 per cent.

‘P points’ means the points about which the driver’s head rotates when he views objects on a horizontal plane at eye level.

‘E points’ means points representing the centres of the driver’s eyes and used to assess the extent to which A pillars obscure the field of vision.

‘A pillar’ means any roof support forward of the vertical transverse plane located 68 mm in front of the V points and includes non-transparent items such as windscreen mouldings and door frames, attached or contiguous to such a support.

‘Horizontal seat-adjustment range’ means the range of normal driving positions designated by the vehicle manufacturer for the adjustment of the driver’s seat in the direction of the X axis (see paragraph 2.3 above).

‘Extended seat-adjustment range’ means the range designated by the vehicle manufacturer for the adjustment of the seat in the direction of the X axis (see paragraph 2.3 above) beyond the range of normal driving positions specified in paragraph 2.16 and used for converting seats into beds or facilitating entry to the vehicle.

3. APPLICATION FOR APPROVAL

The application for approval of a vehicle type with regard to the driver’s field of vision shall be submitted by the vehicle manufacturer or by his authorized representative.

particulars of the primary reference marks in sufficient detail to enable them to be readily identified and the position of each in relation to the others and to the ‘R’ point verified.

a description of the vehicle type with regard to the items mentioned in paragraph 2.2, together with dimensional drawings and either a photograph or an exploded view of the passenger compartment. The numbers and/or symbols identifying the vehicle type shall be specified; and

It shall be accompanied by the documents mentioned below in triplicate and include the following particulars:

A vehicle representative of the vehicle type to be approved shall be submitted to the Technical Service conducting the approval tests.

4. APPROVAL

If the vehicle type submitted for approval pursuant to this Regulation meets the requirements of paragraph 5 below, approval of that vehicle shall be granted.

An approval number shall be assigned to each type approved; its first two digits (00 for the Regulation in its initial form) shall indicate the series of amendments incorporating the most recent major technical amendments made to the Regulation at the time of issue of the approval. The same Contracting Party shall not assign the same number to the same vehicle type equipped with another type of field of vision, or to another vehicle type.

Notice of approval or of refusal or withdrawal of approval pursuant to this Regulation shall be communicated to the Parties to the Agreement which apply this Regulation by means of a form conforming to the model in Annex 1 and photographs and/or plans supplied by the applicant being in a format not exceeding A4 (210 × 297 mm), or folded to that format, and on an appropriate scale.

the number of this Regulation, followed by the letter ‘R’, a dash and the approval number to the right of the circle prescribed in paragraph 4.4.1 above.

a circle surrounding the letter ‘E’ followed by the distinguishing number of the country which has granted approval (3) ;

There shall be affixed, conspicuously and in a readily accessible place specified on the approval form, to every vehicle conforming to a vehicle type approved under this Regulation, an international approval mark conforming to the model described in Annex 2, consisting of:

If the vehicle conforms to a vehicle type approved under one or more other Regulations, annexed to the Agreement, in the country which has granted approval under this Regulation, the symbol prescribed in paragraph 4.4.1 need not be repeated; in such a case, the Regulation and approval numbers and the additional symbols shall be placed in vertical columns to the right of the symbol prescribed in paragraph 4.4.1 above.

The approval mark shall be clearly legible and be indelible.

The approval mark shall be placed close to or on the vehicle data plate.

5. SPECIFICATIONS

5.1. Driver’s field of vision.

to verify compliance with the forward-vision requirement on the opposite half of the windscreen, three additional datum points, symmetrical to the points defined in paragraphs 5.1.1.1 to 5.1.1.3 in relation to the median longitudinal plane of the vehicle, are obtained.

The transparent area of the windscreen must include at least the windscreen datum points (see Annex 4, appendix, figure 1):

The angle of obstruction of the ‘A’ pillar on the passenger side, as defined in paragraph 5.1.2.1.2, need not be determined if the two pillars are located symmetrically in relation to the median longitudinal vertical plane of the vehicle.

The angle of obstruction for each ‘A’ pillar, as described in paragraph 5.1.2.1, shall not exceed 6° (see Annex 4, appendix, figure 3). In the case of armoured vehicles that angle shall not exceed 10°.

repeat the same procedure, taking a plane declining at an angle of 5° downwards in relation to the horizontal plane passing forward through Pm (see Annex 4, appendix, figure 2).

starting from the Pm point situated at the location defined in paragraph 5.3.1.1, draw a plane forming an angle of 2° upwards in relation to the horizontal plane passing forward through Pm. Determine the horizontal section of the ‘A’ pillar starting from the foremost point of the intersection of the ‘A’ pillar and the inclined plane (see Annex 4, appendix, figure 2).

The angle of obstruction of each A pillar shall be measured by superimposing in a plane the following two horizontal sections:

The angle of obstruction of the A pillar on the driver’s side is the angle formed on the plane view by a parallel, starting from E2, to the tangent joining E1 with the outer edge of section S2 and the tangent joining E2 to with the inner edge of section S1 (see Annex 4, appendix, figure 3).

The angle of obstruction of the A pillar on the passenger side is the angle formed on the plane view by the tangent joining E3 to the inner edge of section S1 and a parallel, starting from E3, to the tangent joining E4 to the outer edge of section S2 (see Annex 4, appendix, figure 3).

No vehicle shall have more than two A pillars.

within zone A located ‘defrosting/demisting’ normally in ‘zigzag’ or sinusoidal form having the following dimensions:

printed conductors: 1,0 mm. These ‘radio aerial’ conductors shall not cross zone A (4) . However, three ‘radio aerial’ conductors may cross zone A if their width does not exceed 0,5 mm;

The following are not considered to be obstructions to the field of vision:

Other than the obstructions created by the A pillars, the fixed or movable vent or side window division bars, outside radio aerials, rear-view mirrors and windscreen wipers, there should be no obstruction in the driver’s 180° forward direct field of vision below a horizontal plane passing through V1, and above three planes through V2, one being perpendicular to the plane X-Z and declining forward 4° below the horizontal, and the other two being perpendicular to the plane Y-Z and declining 4° below the horizontal (see Annex 4, appendix, figure 4).

The steering wheel, if adjustable, shall be placed in the normal position indicated by the manufacturer or, failing that, midway between the limits of its range(s) of adjustment.

An obstruction created by the steering-wheel rim and the instrument panel inside the steering wheel will be tolerated if a plane through V2, perpendicular to the plane X-Z and tangential to the highest part of the steering-wheel rim, is declined at least 1° below the horizontal.

5.2. Position of the V points

The position of the V points in relation to the ‘R’ point, as indicated by XYZ coordinates from the three dimensional reference grid, are as shown in Tables I and IV.

Table I indicates the basic coordinates for a design seat-back angle of 25°. The positive direction for the coordinates is indicated in Annex 4, appendix, figure 1.

5.3. Position of the P points

The position of the P points in relation to the ‘R’ point, as indicated by the XYZ coordinates from the three-dimensional reference grid, are as shown by Tables II, III and IV.

The Pm point is the point of intersection between the straight line joining P1, P2 and the longitudinal vertical plane passing through the ‘R’ point.

Table II sets out the base coordinates for a design seat-back angle of 25°. The positive direction of the coordinates is set out in Annex 4, appendix, figure 1.

Table III indicates the further corrections to be made to the X coordinates of P1 and P2 when the horizontal seat-adjustment range as defined in paragraph 2.16 exceeds 108 mm. The positive direction for the coordinates is indicated in Annex 4, appendix, figure 1.

5.4. Correction for design seat-back angles other than 25°

Table IV indicates the further corrections to be made to the X and Z coordinates of each P point and each V point when the design seat-back angle is not 25°. The positive direction for the coordinates is indicated in Annex 4, appendix, figure 1.

Table IV

5.5. Position of the E points

The straight line joining E1 and E2 is rotated about P1 until the tangent joining E1 to the outer edge of Section 2 of the ‘A’ pillar on the driver’s side is normal to the straight line E1-E2 (see Annex 4, appendix, figure 3).

E3 and E4 are each 104 mm from points P2 E3 is 65 mm from E4 (see Annex 4, Appendix, Figure 4).

The straight line E3-E4 is rotated about P2 until the tangent joining E4 to the outer edge of Section 2 of the A pillar on the passenger’s side is normal to the straight line E3-E4 (see Annex 4, appendix, figure 3).

6. TEST PROCEDURE

6.1. Driver’s field of vision

The dimensional relationships between the vehicle’s primary reference marks and the three-dimensional reference grid shall be determined by the procedure prescribed in Annex 4.

The position of the points V1 and V2 is determined in relation to the ‘R’ point as indicated by the XYZ coordinates of the three-dimensional reference grid and are shown in Table I under paragraph 5.2.2 and Table IV under paragraph 5.4. The windscreen datum points shall then be found from the corrected V points as prescribed in paragraph 5.1.1.

The relationship between the P points, the ‘R’ point, and the centre-line of the driver’s seating position, as indicated by XYZ coordinates from the three-dimensional reference grid, shall be determined from Tables II and III in paragraph 5.3. The correction for design seat-back angles other than 25° is shown in Table IV under 5.4.

The angle of obstruction (see paragraph 5.1.2) shall be measured in the inclined planes, as indicated in Annex 4, appendix, figure 2. The relationship between P1 and P2, which are connected to E1 and E2 and E3 and E4 respectively, is shown in Annex 4, appendix, figure 5.

Straight line E1-E2 shall be set as described in paragraph 5.5.2. The angle of obstruction of the A pillar on the driver’s side shall be measured as specified in paragraph 5.1.2.1.1.

Straight line E3-E4 shall be set as described in paragraph 5.5.4. The angle of obstruction of the A pillar on the passenger side shall then be measured as specified in paragraph 5.1.2.1.2.

The manufacturer may measure the angle of obstruction either on the vehicle or in the drawings. In the event of doubt the Technical Services may require the tests be carried out on the vehicle.

7. MODIFICATION OF VEHICLE TYPE AND EXTENSION OF APPROVAL

consider that the modifications made affect the conditions of the granting of the approval and require further tests or additional checks before granting an extension of approval.

consider that the modifications made do not have an adverse effect on the conditions of the granting of the approval and grant an extension of approval;

Every modification of the vehicle type as defined in paragraph 2.2 above shall be notified to the Administrative Department which approved the vehicle type. The department may then either:

Confirmation or refusal of approval, specifying the alterations, shall be communicated by the procedure specified in paragraph 4.3 above to the Contracting Parties to the Agreement which apply this Regulation.

The Competent Authority shall inform the other Contracting Parties of the extension by means of the communication form which appears in Annex 2 to this Regulation. It shall assign a serial number to each extension, to be known as the extension number.

8. CONFORMITY OF PRODUCTION

Procedures concerning conformity of production shall conform to the general provisions defined in Appendix 2 to the Agreement (E/ECE/324-E/ECE/TRANS/505/Rev.2) and meet the following requirements:

A vehicle approved pursuant to this Regulation shall be so manufactured as to conform to the type approved by meeting the requirements of paragraph 5 above;

The Competent Authority which has granted approval may at any time verify the conformity of control methods applicable to each production unit. The normal frequency of such inspections shall be once every two years.

9. PENALTIES FOR NON-CONFORMITY OF PRODUCTION

The approval granted in respect of a vehicle type pursuant to this Regulation may be withdrawn if the requirements laid down in paragraph 8 above are not complied with.

If a Contracting Party withdraws an approval it had previously granted, it shall forthwith so notify the other Contracting Parties applying this Regulation by sending them a communication form conforming to the model in Annex 1 to this Regulation.

10. PRODUCTION DEFINITELY DISCONTINUED

If the holder of the approval completely ceases to manufacture a type of vehicle approved in accordance with this Regulation, he shall so inform the authority which granted the approval, which in turn shall forthwith inform the other Contracting Parties to the Agreement applying this Regulation by means of a communication form conforming to the model in Annex 1 to this Regulation.

11. NAMES AND ADDRESSES OF THE TECHNICAL SERVICES RESPONSIBLE FOR CONDUCTING APPROVAL TESTS AND OF ADMINISTRATIVE DEPARTMENTS

The Contracting Parties to the Agreement applying this Regulation shall communicate to the United Nations Secretariat the names and addresses of the Technical Services responsible for conducting approval tests and of the Administrative Departments which grant approval and to which forms certifying approval or extension or refusal or withdrawal of approval are to be sent.

(1) As defined in Annex 7 to the Consolidated Resolution on the Construction of Vehicles (R.E.3) (document TRANS/WP.29/78/Rev.1/Amend.2, as last amended by Amend.4).

(2) The mass of a vehicle in running order includes the mass of the vehicle and its body with cooling fluid, lubricants, fuel, 100 per cent of other liquids, tools, spare wheel and driver. The mass of the driver is evaluated at 75 kg (distributed as follows: 68 kg for the mass of the occupant and 7 kg for the mass of luggage, in accordance with ISO Standard 2416:1992. The tank contains 90 per cent and the other liquid-containing appliances (other than those intended for waste water) 100 per cent of the capacity declared by the manufacturer.

(3) 1 for Germany, 2 for France, 3 for Italy, 4 for the Netherlands, 5 for Sweden, 6 for Belgium, 7 for Hungary, 8 for the Czech Republic, 9 for Spain, 10 for Serbia, 11 for the United Kingdom, 12 for Austria, 13 for Luxembourg, 14 for Switzerland, 15 (vacant), 16 for Norway, 17 for Finland, 18 for Denmark, 19 for Romania, 20 for Poland, 21 for Portugal, 22 for the Russian Federation, 23 for Greece, 24 for Ireland, 25 for Croatia, 26 for Slovenia, 27 for Slovakia, 28 for Belarus, 29 for Estonia, 30 (vacant), 31 for Bosnia and Herzegovina, 32 for Latvia, 33 (vacant), 34 for Bulgaria, 35 (vacant), 36 for Lithuania, 37 for Turkey, 38 (vacant), 39 for Azerbaijan, 40 for the former Yugoslav Republic of Macedonia, 41 (vacant), 42 for the European Community (approvals are granted by the member States which use their own ECE approval marks), 43 for Japan, 44 (vacant), 45 for Australia, 46 for Ukraine, 47 for South Africa, 48 for New Zealand, 49 for Cyprus, 50 for Malta, 51 for the Republic of Korea, 52 for Malaysia, 53 for Thailand, 54 and 55 (vacant) and 56 for Montenegro. Subsequent numbers shall be assigned to other countries in the chronological order in which they ratify the Agreement Concerning the Adoption of Uniform Technical Prescriptions for Wheeled Vehicles, Equipment and Parts which can be fitted and/or be used on Wheeled Vehicles and the Conditions for Reciprocal Recognition of Approvals Granted on the Basis of these Prescriptions, or in which they accede to that Agreement, and the numbers thus assigned shall be communicated by the Secretary-General of the United Nations to the Contracting Parties to the Agreement.

(4) As defined in Annex 18, paragraph 2.2 of Regulation No 43 concerning the approval of safety glazing and glazing material.

ANNEX 3

Procedure for determining the ‘H’ point and the actual torso angle for seating positions in motor vehicles

1. PURPOSE

1.1. The procedure described in this annex is used to establish the ‘H’ point location and the actual torso angle for one or several seating positions in a motor vehicle and to verify the relationship of measured data to design specification given by the vehicle manufacturer (1).

2. DEFINITIONS

For the purposes of this annex.

2.1. ‘Reference data’ means one or several of the following characteristics of a seating position:

2.1.1. the ‘H’ point and the ‘R’ point and their relationship;

2.1.2. the actual torso angle and the design torso angle and their relationship.

2.2. ‘Three-dimensional H-point machine’ (3-D ‘H’ machine) means the device used for the determination of ‘H’ points and actual torso angles. This device is described in Appendix 1 to this annex.

2.3. ‘H’ point means the pivot centre of the torso and thigh of the 3-D H machine installed in the vehicle seat in accordance with the procedure described in paragraph 4 below. The ‘H’ point is located in the centre of the centre line of the device which is between the ‘H’ point sight buttons on either side of the 3-D H machine. The ‘H’ point corresponds theoretically to the ‘R’ point (for tolerances, see paragraph 3.2.2 below). Once determined in accordance with the procedure described in paragraph 4, the ‘H’ point is considered as fixed in relation to the seat-cushion structure and as moving with it when the seat is adjusted.

2.4. ‘R’ point or ‘seating reference point’ means a design point defined by the vehicle manufacturer for each seating position and established with respect to the three-dimensional reference system.

2.5. ‘Torso line’ means the centre line of the probe of the 3-D H machine with the probe in the fully rearward position.

2.6. ‘Actual torso angle’ means the angle measured between a vertical line through the ‘H’ point and the torso line using the back angle quadrant on the 3-D H machine. The actual torso angle corresponds theoretically to the design torso angle (for tolerances, see paragraph 3.2.2 below).

2.7. ‘Design torso angle’ means the angle measured between a vertical line through the ‘R’ point and the torso line in a position corresponding to the design position of the seat-back specified by the vehicle manufacturer.

2.8. ‘Centre plane of occupant’ (CPO) means the median plane of the 3-D H machine positioned in each designated seating position; it is represented by the co-ordinate of the ‘H’ point on the Y axis. For individual seats, the centre plane of the seat coincides with the centre plane of the occupant. For other seats, the centre plane of the occupant is specified by the manufacturer.

2.9. ‘Three-dimensional reference system’ means a system as described in Appendix 2 of this annex.

2.10. ‘Fiducial marks’ are physical points (holes, surfaces, marks or indentations) on the vehicle body as defined by the manufacturer.

2.11. ‘Vehicle measuring attitude’ means the position of the vehicle as defined by the coordinates of fiducial marks in the three-dimensional reference system.

3. REQUIREMENTS

3.1. Data presentation

For each seating position where reference data are required in order to demonstrate compliance with the provisions of this Regulation, all or an appropriate selection of the following data shall be presented in the form indicated in Appendix 3 of this annex:

3.1.1. the coordinates of the ‘R’ point relative to the three-dimensional reference system;

3.1.2. the design torso angle;

3.1.3. all indications necessary to adjust the seat (if it is adjustable) to the measuring position set out in paragraph 4.3 below.

3.2. Relationship between measured data and design specifications

3.2.1. The coordinates of the ‘H’ point and the value of the actual torso angle obtained by the procedure set out in paragraph 4 below shall be compared, respectively, with the coordinates of the ‘R’ point and the value of the design torso angle indicated by the vehicle manufacturer.

3.2.2. The relative positions of the ‘R’ point and the ‘H’ point and the relationship between the design torso angle and the actual torso angle shall be considered satisfactory for the seating position in question if the ‘H’ point, as defined by its coordinates, lies within a square of 50 mm side length with horizontal and vertical sides whose diagonals intersect at the ‘R’ point, and if the actual torso angle is within 5° of the design torso angle.

3.2.3. If these conditions are met, the ‘R’ point and the design torso angle shall be used to demonstrate compliance with the provisions of this Regulation;

3.2.4. If the ‘H’ point or the actual torso angle does not satisfy the requirements of item 3.2.2 above, the ‘H’ point and the actual torso angle shall be determined twice more (three times in all). If the results of two of these three operations satisfy the requirements, the conditions of paragraph 3.2.3 above shall apply;

3.2.5. If the results of at least two of the three operations described in paragraph 3.2.4 above do not satisfy the requirements of paragraph 3.2.2 above, or if the verification cannot take place because the vehicle manufacturer has failed to supply information regarding the position of the ‘R’ point or regarding the design torso angle, the centroid of the three measured points or the average of the three measured angles shall be used and be regarded as applicable in all cases where the ‘R’ point or the design torso angle is referred to in this Regulation.

4. PROCEDURE FOR ‘H’ POINT AND ACTUAL TORSO ANGLE DETERMINATION

4.1. The vehicle shall be preconditioned, at the manufacturer’s discretion, at a temperature of 20 °C + 10 °C to ensure that the seat material reaches room temperature. If the seat to be checked has never been sat upon, a 70 to 80 kg person or device shall sit on the seat twice for one minute to flex the cushion and back. At the manufacturer’s request, all seat assemblies shall remain unloaded for a minimum period of 30 minutes prior to installation of the 3-D H machine.

4.2. The vehicle shall be in the measuring attitude defined in paragraph 2.11 above.

4.3. The seat, if it is adjustable, shall be adjusted first to the rearmost normal driving or riding position, as indicated by the vehicle manufacturer, taking into consideration only the longitudinal adjustment of the seat, excluding seat travel used for purposes other than normal driving or riding positions. Where other modes of seat adjustment exist (vertical, angular, seat-back, etc.), these will then be adjusted to the position specified by the vehicle manufacturer. For suspension seats, the vertical position shall be rigidly fixed corresponding to a normal driving position as specified by the manufacturer.

4.4. The area of the seating position taken up by the 3-D H machine shall be covered by a muslin cotton, of sufficient size and appropriate texture, described as a plain cotton fabric having 18,9 threads per cm2 and weighing 0,228 kg/m2, or knitted or non-woven fabric having equivalent characteristics.

If the test is performed on a seat outside the vehicle, the floor on which the seat is placed shall have the same essential characteristics (2) as the floor of the vehicle in which the seat is intended to be used.

4.5. Place the seat and back assembly of the 3-D H machine so that the centre plane of the occupant (CPO) coincides with the centre plane of the 3-D H machine. At the manufacturer’s request, the 3-D H machine may be moved inboard with respect to the CPO if the 3-D H machine is located so far outboard that the seat edge will not permit levelling of the 3-D H machine.

4.6. Attach the foot and lower leg assemblies to the seat-pan assembly, either individually or by using the T-bar and lower leg assembly. The line through the ‘H’ point sight buttons shall be parallel to the ground and perpendicular to the longitudinal centre plane of the seat.

4.7. Adjust the feet and leg positions of the 3-D H machine as follows:

4.7.1. Designated seating position: driver and outside front passenger

4.7.1.1. Both feet and leg assemblies shall be moved forward in such a way that the feet take up natural positions on the floor, between the operating pedals if necessary. Where possible the left foot shall be located at approximately the same distance to the left of the centre plane of the 3-D H machine as the right foot is to the right. The spirit level verifying the transverse orientation of the 3-D H machine is brought to the horizontal by readjustment of the seat pan if necessary, or by adjusting the leg and foot assemblies towards the rear. The line passing through the ‘H’ point sight buttons shall be maintained perpendicular to the longitudinal centre plane of the seat.

4.7.1.2. If the left leg cannot be kept parallel to the right leg and the left foot cannot be supported by the structure, move the left foot until it is supported. The alignment of the sight buttons shall be maintained.

4.7.2. Designated seating position: outboard rear seat

For rear seats or auxiliary seats, the legs are located as specified by the manufacturer. If the feet then rest on parts of the floor which are at different levels, the foot which first comes into contact with the front seat shall serve as a reference and the other foot shall be so arranged that the spirit level giving the transverse orientation of the seat of the device indicates the horizontal.

4.7.3. Other designated seating positions:

The general procedure indicated in paragraph 4.7.1 above shall be followed, except that the feet shall be placed as specified by the vehicle manufacturer.

4.8. Apply lower leg and thigh weights and level the 3-D H machine.

4.9. Tilt the back pan forward against the forward stop and draw the 3-D H machine away from the seat-back using the T-bar. Reposition the 3-D H machine on the seat by one of the following methods:

4.9.1. If the 3-D H machine tends to slide rearward, use the following procedure. Allow the 3-D H machine to slide rearward until a forward horizontal restraining load on the T-bar is no longer required, i.e. until the seat pan contacts the seat-back. If necessary, reposition the lower leg.

4.9.2. If the 3-D H machine does not tend to slide rearward, use the following procedure. Slide the 3-D H machine rearward by applying a horizontal rearward load to the T-bar until the seat pan contacts the seat-back (see figure 2 of the Appendix 1 to this annex).

4.10. Apply a 100 ± 10 N load to the back and pan assembly of the 3-D H machine at the intersection of the hip angle quadrant and the T-bar housing. The direction of load application shall be maintained along a line passing through the above intersection to a point just above the thigh bar housing (see figure 2 of Appendix 1 to this annex). Then carefully return the back pan to the seat-back. Care must be exercised throughout the remainder of the procedure to prevent the 3-D H machine from sliding forward.

4.11. Install the right and left buttock weights and then, alternately, the eight torso weights. Maintain the 3-D H machine level.

4.12. Tilt the back pan forward to release the tension on the seat-back. Rock the 3-D H machine from side to side through a 10° arc (5° to each side of the vertical centre plane) for three complete cycles to release any accumulated friction between the 3-D H machine and the seat.

During the rocking action, the T-bar of the 3-D H machine may tend to diverge from the specified horizontal and vertical alignment. The T-bar must therefore be restrained by applying an appropriate lateral load during the rocking motions. Care shall be exercised in holding the T-bar and rocking the 3-D H machine to ensure that no inadvertent exterior loads are applied in a vertical or fore and aft direction.

The feet of the 3-D H machine are not to be restrained or held during this step. If the feet change position, they should then be allowed to remain in that attitude for the moment.

Carefully return the back pan to the seat-back and check the two spirit levels for zero position. If any movement of the feet has occurred during the rocking operation of the 3-D H machine, they must be repositioned as follows:

Alternately, lift each foot off the floor the minimum necessary amount until no additional foot movement is obtained. During this lifting, the feet are to be free to rotate; no forward or lateral loads are to be applied. When each foot is placed back in the down position, the heel is to be in contact with the structure designed for this.

Check the lateral spirit level for zero position; if necessary, apply a lateral load to the top of the back pan sufficient to level the 3-D H machine’s seat pan on the seat.

4.13. Holding the T-bar to prevent the 3-D H machine from sliding forward on the seat cushion, proceed as follows:

(a) return the back pan to the seat-back;

(b) alternately apply and release a horizontal rearward load, not to exceed 25 N, to the back angle bar at a height approximately at the centre of the torso weights until the hip angle quadrant indicates that a stable position has been reached after load release. Care should be taken to ensure that no exterior downward or lateral loads are applied to the 3-D H machine. If another level adjustment of the 3-D H machine is necessary, rotate the back pan forward, re-level, and repeat the procedure from paragraph 4.12.

4.14. Take all measurements:

4.14.1. The coordinates of the ‘H’ point are measured with respect to the three-dimensional reference system.

4.14.2. The actual torso angle is read at the back angle quadrant of the 3-D H machine with the probe in its fully rearward position.

4.15. If a rerun of the installation of the 3-D H machine is desired, the seat assembly shall remain unloaded for a minimum period of 30 minutes prior to the re-run. The 3-D H machine shall not be left loaded on the seat assembly longer than the time required to perform the test.

4.16. If the seats in the same row can be regarded as similar (bench seat, identical seats, etc.) only one ‘H’ point and one actual torso angle shall be determined for each row of seats, the 3-D H machine described in the Appendix 1 to this annex being seated in a place regarded as representative for the row.

This place shall be:

4.16.1. In the case of the front row, the driver’s seat.

4.16.2. In the case of the rear row or rows, an outer seat.

(1) In any seating position other than front seats where the ‘H’ point cannot be determined using the ‘three-dimensional H-point machine’ or other procedures, the ‘R’ point indicated by the vehicle manufacturer may be taken as a reference at the discretion of the Competent Authority.

(2) Tilt angle, height difference with a seat mounting, surface texture, etc.

Appendix 1 Description of the three-dimensional ‘H’ point machine (3-D H machine) (1) 1. BACK AND SEAT PANS The back and seat pans are constructed of reinforced plastic and metal; they simulate the human torso and thigh and are mechanically hinged at the ‘H’ point. A quadrant is fastened to the probe hinged at the ‘H’ point to measure the actual torso angle. An adjustable thigh bar, attached to the seat pan, establishes the thigh centre line and serves as a baseline for the hip angle quadrant. 2. BODY AND LEG ELEMENTS Lower leg segments are connected to the seat pan assembly at the T-bar joining the knees, which is a lateral extension of the adjustable thigh bar. Quadrants are incorporated in the lower leg segments to measure knee angles. Shoe and foot assemblies are calibrated to measure the foot angle. Two spirit levels orient the device in space. Body element weights are placed at the corresponding-centres of gravity to provide seat penetration equivalent to a 76 kg male. All joints of the 3-D H machine should be checked for free movement without encountering any noticeable friction. Figure 1 3-D H machine elements designation Figure 2 Dimensions of the 3-D H machine elements and load distribution (1) The machine corresponds to that described in ISO Standard 6549-1980. For details of the construction of the 3-D H machine refer to Society of Automotive Engineers (SAE), 400 Commonwealth Drive, Warrendale, Pennsylvania 15096, United States of America.

Appendix 2 THREE-DIMENSIONAL REFERENCE SYSTEM 1. The three-dimensional reference system is defined by three orthogonal planes established by the vehicle manufacturer (see figure) (1). 2. The vehicle measuring attitude is determined by positioning the vehicle on a supporting surface such that the coordinates of the fiducial marks correspond to the values indicated by the manufacturer. 3. The coordinates of the ‘R’ point and the ‘H’ point are established in relation to the fiducial marks defined by the vehicle manufacturer. (1) The reference system corresponds to ISO Standard 4130:1978.