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Spot Speed Study

Spot Speed Study. Before anything else. Read the manual carefully. It is your homework What is covered in the following slides is just general. General. The data is to be used for assessing general speed trends and for setting speed limits.

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Spot Speed Study

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  1. Spot Speed Study

  2. Before anything else • Read the manual carefully. It is your homework • What is covered in the following slides is just general

  3. General • The data is to be used for assessing general speed trends and for setting speed limits. • The equipment for our data collection procedure is a hand-held radar. • Radar usage • Radar checkout

  4. Data Collection • Name of the safety officer • Choose section of road • Not close to intersection • Off-peak period during daylight hours on a typical weekday • Hide  • I will contact Police to cover you

  5. Data collection form

  6. Data analysis • What should you do with the collected speeds? • What else, statistical analysis! • Remember that old stuff: Mean, standard deviation,… • Plus a few more things

  7. Speed Statistics u = uj/N f(ui – u)2 s = N - 1

  8. Types of Speed Measurements 85% 50%

  9. Frequency histogram example

  10. Frequency distribution curve

  11. Cumulative frequency distribution curve

  12. Helping calculation table

  13. Interpret and conclude • Answer questions in manual • Prepare your presentation

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