Wyoming Administrative Code › Agency 045 - Transportation, Dept. of › Sub-Agency 0003 - General Agency, Board or Commission Rules › Chapter 30 - PROCEDURES FOR LOCALLY ESTABLISHING SPEED LIMITS › Appendix I - Procedures for Establishing Local Authority Set Speed Limits on Wyoming Paved Roads › Section 1.3 - SPEED STUDY DATA COLLECTION SHEET

Current through July 13, 2024
(1)
The Speed Study Data
					 Collection Sheet (Form TR-10) has been developed in conjunction with the Speed
					 Study Worksheet (Form TR-11) for the collection of speed data in the field.
					 These forms can be obtained from the Wyoming Department of Transportation for
					 use on a computer. An example of a blank collection sheet is shown in Figure
					 1-1. To limit the range of speeds to what is allowed by the worksheet, the
					 lowest anticipated free-flow speed at the study location must be entered in the
					 red box. To help determine what value to enter in the red box, Table 1-1
					 provides some guidance on what lowest anticipated free-flow speeds might apply
					 based on the posted speed limit and whether the area of the study is in an
					 urban area, urban/rural fringe, or in a rural area.
Table 1-1 Lowest Anticipated Free-flow
					 Speeds
Posted Speed (mph)
Extent of Roadside Development
Urban
Fringe Area
Rural
[LESS THAN EQUAL TO] 30
10
10
-
35 - 40
10
15
20
45 - 50
15
20
25
55 - 60
25
30
35
[GREATER THAN EQUAL TO] 65
-
40
45
(2)
Prior to heading to the
					 field to collect spot speed study data, it is recommended that several Speed
					 Study Data Collection Sheets having varying lower limits be printed out for use
					 by the data collection personnel.
(3)
When collecting speed
					 study data, fill out the heading of the Speed Study Data Collection Sheet
					 completely.
(4)
The observer enters a
					 tally mark (\) in a data block under the appropriate direction for each
					 observance of a speed. If more than 15 vehicles are observed at any particular
					 speed in one direction, tally marks slanting in the opposite direction can be
					 entered over the tally mark previously entered thus forming an X, which
					 represents two vehicles observed at that speed. An example of a completed Speed
					 Study Data Collection Sheet is shown in Figure 1-2.
(5)
If there is no interest
					 in knowing the speed statistics for each direction, but only the combined
					 directions, then all speed observations for both directions of travel can be
					 entered in one column. This avoids having to add the number of tally marks from
					 the two directions when entering the data into the Speed Study
					 Worksheet.
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(6)
The Speed Study Data
					 Collection Sheet can also be used to document speeds based on vehicle class,
					 either by direction or for both directions. This is accomplished by using
					 one-letter classification codes rather than tally marks. Classification codes
					 that may be used include the following:
P = passenger vehicle (includes cars, pickups, vans and
					 SUVs)
T = truck (includes single units with 6 or more tires,
					 buses, RVs, and pickups pulling trailers)
S = semi-truck (tractor-trailer combinations)
M = motorcycle