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Section 7: Traffic Survey Count Analysis

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Count Data Processing

Vehicle and pedestrian count data must be tabulated and checked against established traffic signal warrants. The vehicle data are recorded on the Vehicle Volume Summary Sheets or the Vehicle Volume Field Sheets. The pedestrian data are recorded on the Pedestrian Volume Field Sheet or the Pedestrian Volume Summary Sheet.

The tabulation and checking can be accomplished manually or by using an automated system.

Manual Method. Manual tabulation is accomplished by transferring the data to the Traffic Survey — Count Analysis Form (discussed under the following subheading).

Automated Methods. Traffic count data may be transferred into an automated system for tabulation and checking against warrants. Districts may use commercially available software for this purpose or TxDOT’s mainframe system, the Intersection Traffic and Pedestrian Count Analysis Program. (The mainframe program is discussed later in this section.)

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The Traffic Survey — Count Analysis Form

The Traffic Survey — Count Analysis Form is used to compare the data from the traffic study with the accepted signal warrants. The form shows the following information:

  • location data (major and minor street, control and section, etc.)
  • date of survey
  • 85th percentile speed on major street
  • accepted traffic signal warrants
  • vehicle and pedestrian volumes for the eight highest, non-overlapping hours of the day, as determined from the vehicle and pedestrian counts.

This form shows both rural and urban warrants; therefore, the warrants applied should be indicated on the form.

Form Available. A sample of this form is provided in Appendix A of the hard copy print version of this manual. This sample form may be photocopied as necessary. Copies may also be obtained from the Traffic Operations Division. In the on-line version of this manual, an MS Word version of this form may be opened and printed out by clicking on the following file name: TFF-TSCA.

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Intersection Traffic and Pedestrian Count Analysis Program

The Intersection Traffic and Pedestrian Count Analysis Program is a mainframe program that tabulates traffic counts made at intersections and checks the counts against established traffic signal warrants. The program is accessible for data entry and report generation through RJEJCL 19 in ROSCOE.

Pedestrian count data can be submitted with the vehicle count data. The approach speeds and number of lanes on each approach must be included on the computer input forms.

After data are entered, the program furnishes the following:

  • printed Vehicle Volume Summary Sheets
  • flow diagrams (unless requested otherwise) as follows:
    • Total Traffic Count
    • 15-minute A.M. Peak
    • 15-minute P.M. Peak
    • Peak Hour
    • Second Peak Hour
  • computer-generated Traffic Survey Count Analysis Sheet (NOTE: as of this writing, Revision 5 to the TMUTCD has not been incorporated into this program)
  • actuated warrant curve plots (1, 2, 4, and 8 high hours)
  • graphs plotting vehicle volumes versus hours of day.

The Intersection Traffic and Pedestrian Count Analysis Program is maintained by the Technology Services Division (TSD). Questions concerning the program should be directed to the Traffic Operations Division (TRF).

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