RouteType

public enum RouteType : UInt32, CaseIterable, Codable

Indicates the level of significance of a route in a range from 1 to 6. A value of 1 stands for the most major route and 6 the most minor. The route type indicates that the road’s name is actually a route number and in many countries is displayed in a shield symbol (e.g., Interstate and State routes in the U.S.). See https://developer.here.com/documentation/here-map-content-schema/dev_guide/topics_schema/streetname.routetype.html