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NEXCO EAST Kanto Regional Head Office (Saitama City, Saitama Prefecture) would like to inform you that it will be implementing new measures to prevent wire rope contact accidents in the provisional two-lane section of the C4 Ken-o Expressway (hereinafter referred to as "Ken-O Road") from Togane Junction (hereinafter referred to as "JCT") to Mobara Kita Interchange (hereinafter referred to as "IC").

(1) Measures taken

Installation of "vehicle guidance lines"

A "vehicle guidance line" is a green line installed on the road surface in a temporary two-lane section. Its purpose is to visually indicate the driver's position and deter them from approaching the curb fence (wire rope).

[Image of countermeasures]

(2) Purpose of installation

In the provisional two-lane sections of Expressway, the installation of wire ropes is progressing to prevent vehicles from crossing into the oncoming lane, and accidents involving vehicles crossing into the oncoming lane have decreased significantly. On the other hand, a certain number of accidents involving vehicles coming into contact with the wire ropes still occur, and depending on the circumstances of these accidents, road closures may be necessary, resulting in disruptions to traffic. For this reason, we have been implementing measures such as installing reflective tape to improve visibility in order to prevent accidents involving vehicles coming into contact with the wire ropes.
As a new measure to prevent collisions, we have decided to experimentally install a green line (vehicle guidance line) slightly to the right of the center of the lane to visually indicate the vehicle's position to drivers, thereby ensuring more stable vehicle positioning.
This measure is the first of its kind for NEXCO EAST.

(3) Installation location

Of the section of Ken-O Road Outer Loop between Togane JCT and Mobara-Kita IC,
There are two locations in total: around 234kp to 235kp (approximately 1km) and around 237kp to 238kp (approximately 1km).

(4) Construction period

Scheduled for June 2026 (to be implemented with nighttime road closures)

(5) Points to note when driving

In sections with "vehicle guidance lines," please drive so that the right seat is positioned on the green line. By driving in a way that straddles the green line, you can prevent approaching the section fence (wire rope).

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