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Road disaster prevention measures

Last Updated August 16, 2024

Overview

Of the slopes with a height of 2m or more and an inclination angle of 30 degrees or more facing the road managed by Yokohama City, about 400 places, such as places where continuous inspection was required based on the national inspection guidelines, We promote regular inspections and disaster prevention work to ensure the safety and traffic functions of citizens.

Classification of road cliffs subject to business
① The location where continuous monitoring is required by road disaster prevention inspection and the “Road Disaster Prevention Chart” was created ② Points listed in the road cliff facility ledger (points where Yokohama City has implemented countermeasures in the past) ③ ①②Other than that, places where road disaster prevention measures are required (points specifically approved by Director Doro)

Inspection

●Conduct disaster prevention inspections every five years for all eligible road cliffs.
●Where follow-up is required, the Public Works Office conducts annual visual inspections.

Priority areas

①Areas where measures are required facing emergency transportation routes and bus routes
②Where early measures are needed in a state that has collapsed in the past
③If left unchecked, it may collapse and hinder traffic, and places where early measures are required.

Disaster prevention measures

For cliffs in the road area, we will install structures to prevent slope collapse and protect roads.
In principle, in the case of cliff of private land facing the road, it is a principle that the owner will take measures, but if correspondence is difficult, the city will implement measures from the viewpoint of protecting the road. In that case, the details of construction and the handling of land are determined according to the position above and below the road.

Handling of road cliffs on private land
①Upper part of the road	②Under the road
Construction details: Structures such as temporary protective fences with the aim of preventing earth and sand from flowing into the road even if the cliff collapses.	Construction details: Structures that can prevent slope collapse and protect roads
Land handling: In principle, implemented under a free loan agreement. Transfer to road area by donation, etc. depending on the situation	Land handling: In principle, land will be donated and transferred to the road area. Implemented under a free loan agreement, etc., depending on the situation