East Nippon Expressway Company Limited

Expressway service

NEXCO EAST

Analyzing the Causes of Traffic Congestion and Enact Measures to Break and Ease Traffic Jams

Causes of Congestion

Traffic concentration was the cause of approximately 77% of traffic jams in 2015, 62% of which occurred at uphill slopes and sag sections* on expressways.
*A sag section is the dip area between end of downhill slope and beginning of uphill slope.

Causes of Congestion - Traffic concentration:77%, Accident:16%, Roadwork:2%, Other:5%. Traffic Concentration Locations - Uphill slopes and sagsections:62%, Traffic jam due to connecting road:19%, Interchange:10%, Tunnel:5%, Toll gate:1%, Other:3%

Trends and Analysis of Congestion

We have cut lost time due to traffic congestion* by as much as 50% since the peak of such delays in 2008; however, after holiday special toll discount program was introduced in 2009, lost time significantly increased.

Although lost time decreased with the end of that discount program (a ceiling price of ¥1,000 for rural areas) in 2011, lost time increased due to the impact of recovery work from the damages of the Great East Japan Earthquake and an increase in traffic volume. Since 2013, lost time has again decreased because of various measures to be taken, but it is still high. Thus, we are continually analyzing the causes of traffic congestion and are promoting counter measures against it so that our customers are not kept waiting.

*Index for showing the impact of traffic congestion in terms of time and number of vehicles.

Trends in lost time due to traffic congestion

Trends in lost time due to traffic congestion

Measures against Traffic Congestion

Improvement of Road Structures

We increased the number of lanes and added auxiliary lanes at places where congestion was becoming apparent.

In the vicinity of Hanazono Interchange on Kan-Etsu Expressway

In the vicinity of Hanazono Interchange on Kan-Etsu Expressway

Call to Recover Speed using LED Displays, etc.

In order to eliminate the congestion caused by traffic slowdown on uphill slopes and sag-sections, We use LED displays around the beginning of the congestion to call for recovering speed.

(1)Display “congestion ends” in 300m to 1km before the beginning of congestion (2)Display encouraging “resume speed” behavior near the beginning of congestion

Providing Congestion Forecasts

We provide our own “congestion forecast guides” and other means to provide information on avoiding traffic for a comfortable driving environment. In addition to the forecast, we also provide a real-time traffic information via our website “Drive Plaza” and “Drive Plaza App,” which is an application exclusively for smartphone users.

Congestion Forecast Guide

Overview of providing drive traffic information

Overview of providing drive traffic information
Overview of providing drive traffic information
Drive Traffic Mobile
http://m.drivetraffic.jp/ 外部リンク:別ウィンドウ表示