Are you sure it shouldn’t be “Vehicle width-restrictor”? It is a compound of three nouns and the headed-ness sure seems ambiguous to me. In other words, should it be
( (VehicleNN widthNN)AdjP restrictorNN)NP
or
( VehicleNN (widthNN restictorNN)NN)NP
Both types of compounds common and semantically it is something like “A restrictor on Vehicle width” vs “A width-restrictor for vehicles”.
