In Japan, upgrading traffic signals improved travel times by 17 to 21 percent and increased average speed by 19 to 21 percent.

March 1998

Summary Information

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

Traffic signal upgrades
  • Improved travel time by about 17 to 21 percent on each project.
  • Average travel speed improved from 27.4km/h to 32.6km/h, and from 28.7km/h to 34.8km/h after upgrading.

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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


Typical Deployment Locations

Metropolitan Areas


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: 2000-00116