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Table 11. Example Calculation of Sample Size for Study to Determine 85th Percentile Speed ..... 44 Table 12. Sample Sizes and Data Collection Periods Used by Three States..... 45 Table 13. Speed Check Stations for Three States ..... 47 Table 14.
Data collection forms help organize data for the spot speed study. Appendix G (Example Speed Study Forms) contains a sample "Vehicle Spot Speed Study" data collection sheet from the Florida DOT. 30. The speed profile for a particular road section can only be estimated by measuring individual speeds through a spot speed study.
The following section includes an example of traffic tables and offers a guide to the numbers in the tables, explained panel by panel. The table reproduced here (Table 1) refers to all traffic stops reported in 2022 from law enforcement agencies in the state of Illinois. The counts, rates, percentages and ratios
3. AVERAGE TEST RUN SPEED: Average test run speeds are determined on the basis of five vehicle runs in each direction over the length of the proposed zone. It is not necessary to use an unmarked vehicle, however the use of any vehicle which might be mistaken for a law enforcement vehicle should be avoided. Observations should be made under the ...
Table 1 shows the Illinois statewide results for illustration of pedestrian stop reporting. Following is a guide to each panel of the table. Panel 1 (shaded rows) presents the pedestrian stops, benchmark, and stop rate by racial
The Official Website for the Illinois Secretary of State
In May, 2021, TMWL and SC-B, in cooperation with IDOT’s Bureau of Data Collection (BDC), have provided copies of statistical tables for 852 law enforcement agencies in the state of Illinois, based on data collection provided by the respective agencies on traffic and pedestrian stops.
