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Spot Speed Study

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**Before anything else Read the manual carefully. It is your homework**

What is covered in the following slides is just general

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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

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**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

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Data collection form

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**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

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**Speed Statistics Average speed Speed data Grouped Not grouped**

Standard deviation Variance s2 u = uj/N f(ui – u)2 s = N - 1

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**Types of Speed Measurements**

Median speed The speed at the middle value in a series of spot speeds. Or, 50th-percentile speed Modal speed The speed value that occurs most frequently in a sample of speeds ith-percentile speed The spot speed below which i percent of the vehicles travel, e.g. 85th-percentile speed Pace The range of speed that has the greatest number of observations; usually 10-mph range 85% 50%

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**Frequency histogram example**

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**Frequency distribution curve**

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**Cumulative frequency distribution curve**

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**Helping calculation table**

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**Interpret and conclude**

Answer questions in manual Prepare your presentation

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