What is the standard width dimension of highways?

[McLucas]

Highway lane width standard dimensions are 3.75 meters and 3.5 meters (emergency lane), with design speeds of 80 km/h, 100 km/h, 120 km/h, and 60 km/h (special sections); the road scale is bidirectional four lanes or more, and unidirectional two lanes or more. The following is a specific introduction to highways: 1. Definition of highways: Highways are a type of road classified by technical grade, with a level higher than first-class roads, second-class roads, third-class roads, fourth-class roads, and substandard roads. Highways and national or provincial roads classified by road network status are cross-related, meaning highways are part of national or provincial roads in the road network. 2. Highway network: In urban road systems, expressways can be constructed according to highway standards, because highways and expressways share the same basic structural characteristics. The highway network is different from the concept of highways; the highway network not only includes highway routes that meet technical grade standards but also covers some expressway routes that undertake high-speed transportation functions, mostly closed first-class roads, often connected with other highways for toll collection.