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Speed survey for Broad Street

April 5, 2013 8:15 am by

From Lt.Minton:

Metro count results for 3400 Block of E. Broad St.

Issue: What is the extent of speeding and traffic volume on E. Broad Street in the 3400 block corridor?

Discussion: An analysis of traffic patterns on E. Broad Street was conducted over a period of time spanning 7 days from March 18, 2013 through March 25, 2013. The site is a two way, marked residential roadway geographically running East and West. Land usage is residential. The posted speed limit is 25 mph.

An extrapolated average of 2,868.6 vehicles per day (119.4 vehicles per hour) traveled through the survey site on weekdays (0000-2359 Mon-Fri). On weekends, an average of 2,277 vehicles per day (94.9 vehicles per hour) traveled through the survey site (0000-2359 Sat-Sun).

Vehicle Classes
The following groups comprise the total 18,882 vehicles surveyed:

Class Total Number Percentage (% Rounded)
Motorcycles 112 0.6%
Passenger Cars 15,474 82%
Pickups 2,621 13.9%
Multi Axle Trucks/Buses/Other 675 3.5%


Traffic Volume
Weekday Peak Average Traffic Volume

Time Volume
AM 0800-0900 228.2 vehicles per peak hour
PM 1700-1800 262.4 vehicles per peak hour

Weekend Peak Average Traffic Volume

Time Volume
AM 1100-1200 161 vehicles per peak hour
PM 1200-1300 209.5 vehicles per peak hour

Speed Statistics

Vehicles= 18,882
Posted Speed Limit= 25 mph
Maximum speed= 61.7 mph
Minimum Speed= 5.1 mph
Mean Speed= 26 mph
85% Speed= 31.1 mph
95% Speed= 34 mph

Summary

Of all surveyed vehicles 3.1% or 584 vehicles were traveling between 35-40 mph, and 0.3% or 49 vehicles were in excess of 40 mph. Peak traffic volumes exceed 100 vehicles per hour, the threshold where citizens become upset at high traffic volume. Violations by time of day indicate the greatest number of violations between 0700-0800 and between 1500-1600.

Of all vehicles traveling along this road, 96.4% are within 10 mph of the posted speed limit. Statistically, an officer would have to wait just under 3 minutes to observe a violation exceeding the speed limit by 10 mph. Using the same statistical analysis; an officer would have to wait approximately 30 minutes to observe a violation exceeding the speed limit by 15 mph. Comparing traffic volume with speed violations by time of day shows that when volume is highest, violations maintain steady throughout the day. Speed violations percentages began to increase prior to daytime peak traffic from 0500-0800 compared with the traffic volume during those same times.


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