Benefit

Installing new traffic signals in Japan reduced crash frequency by 75 to 78 percent and upgrading existing traffic signals reduced accidents up to 65 percent.


March 1998
Japan


Summary Information

The report provided the following statistics from 1991 through 1995 (Japanese fiscal years):

New installation of traffic signals
  • Reduced the number of traffic accidents by 75 to 78 percent.
  • Reduced accidents between pedestrians and vehicles by 87 percent.
  • Reduced total casualties by 75 percent.
  • Reduced accidents between vehicles by 73 percent.
  • Reduced surprise encounter accidents (most frequent accidents) by 90 percent.
  • Reduced right-turn accidents (second most frequent accident) by 69 percent.

Traffic signal upgrades
  • Reduced accidents 4 to 28 percent in large areas.
  • Reductions accidents 35 to 65 percent at individual locations such as corridors.
  • Reduced surprise encounter accidents by 76 percent with semi-sensitive control.
  • Reduced accidents between pedestrians and vehicles by 70 percent with pedestrian-activated local control.
  • Reduced surprise encounter accidents by 63 percent using semi-sensitive local control.
  • Reduced accidents between vehicles by 36 percent with high-speed sensitive control.
  • Reduced accidents between vehicles by 33 percent with dilemma-eliminating control.
  • Reduced accidents between vehicles by 36 percent with right-turn sensitive control.
  • Reduced accidents between vehicles by 46 percent with multi-phasing control.
  • Reduced accidents between pedestrians and vehicles by 79 percent with elderly pedestrian activated control.

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Source

Reduction of Traffic Accidents and Improvement of Road Traffic Produced by 5th Five-Year Project for the Installation and Upgrading of Traffic Safety Facilities (for ITS Deployment in Japan)

Author: Saito, Takeshi, et al.

Published By: Japan Traffic Management and Technology Association

Source Date: March 1998


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Goal Areas

Safety

Typical Deployment Locations

Metropolitan Areas

Keywords

coordinated signals, signal coordination, centralized signal control, signal synchronization, traffic signals, advanced signal control, signal timing optimization, coordinated signal control, advanced signal controller, traffic signal retiming, retiming

Benefit ID: 2007-00384