Crash risk along a corridor in Arizona was reduced by 6.7 percent due to traffic signal coordination among two jurisdictions.
The evaluation report contained and assessment of the impact of traffic signal coordination among two jurisdictions along the same arterial corridor. The evaluation team measured the impacts of partial signal coordination along 9.6 km/5.7 mile Scottsdale/Rural road corridor. The corridor contains 21 signals, 16 in Tempe and 5 in Scottsdale. To test the impacts of coordinated signal timing, three signals in Tempe were re-timed to use the same cycle length as the Scottsdale signals, moving the break in signal progression along the corridor south beyond a major freeway access point.
The impacts of this adjustment in signal timing were measured using the floating car technique, with vehicles equipped with GPS receivers for enhanced data collection. This data, combined with a newly developed methodology for estimating emissions impacts and crash risk using speed and acceleration data, allowed assessment of the impacts of the signal coordination on travelers along the mainline of the corridor. Computer simulation allowed assessment of these impacts for the entire corridor, including side streets.
Mainline analysis using test vehicles indicated a crash risk reduction on the mainline of 6.7 percent. Simulation models, however, that considered the entire corridor did not show statistically significant impacts.
Science Applications International Corporation. Cross Jurisdictional Signal Coordination in Phoenix & Seattle: Removing Barriers to Seamless Arterial Travel. U.S. Department of Transportation. Washington, DC: 2000.
Author: C. Zimmerman (Battelle), et. al.
Published By: Federal Highway Administration, U.S. DOT
Prepared by Battelle for the U.S. DOT
Source Date: April 2000
EDL Number: 12743
Other Reference Number: Report No. FHWA-OP-00-015URL: http://ntl.bts.gov/lib/jpodocs/repts_te/12743.pdf
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