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Table 4 Overview of the contents of the base and development plans of A-Route and B-Route expressways, Source: [29]

From: Japan’s transport planning at national level, natural disasters, and their interplays

Type of plan A-routes B-Routes
Base Plan Origin and end of the route; Name of the route;
Intermediate points en route;
Basic technical design (number of lanes, speed); Origin, end and approximate length en route;
Locations of interchanges; Major intermediate points;
Implementation body Technical standard (lanes, speed)
Development plan Municipalities along the route; Name of the route;
Technical design in detail (number of lanes, speed); Origin, end and approximate length;
Locations of interchanges; Municipalities en route;
Approximate envisaged construction costs; Technical design in detail (lanes, speed, width, etc.);
Other minor points to be pointed out. Locations of interchanges;
Approximate envisaged construction costs.