U-routes
U-routes (Uitwijkroutes) are permanent routes that are used to reroute traffic in case of a closure of the main road.
The route identification can be added as an alternative name to the straatnaam.
Laat de plaatsnaam leeg.
The road type should be at least Minor Highway.
The U-routes are marked with an "U" plus number, like U27.
More information on U-routes can be found in the Wegenwiki.