When driving on an express road, which vehicles are prohibited from using it?

Express roads are designed for fast, efficient travel, primarily benefiting motor vehicles that are capable of higher speeds. Mopeds and farm vehicles are typically slower and may not meet the minimum speed regulations required on these types of roads. Therefore, their presence could pose safety risks due to significant speed differentials with faster vehicles like cars and trucks.

In most jurisdictions, including Belgium, express roads usually have specific rules prohibiting slower vehicles, such as mopeds, which are not suited for high-speed travel, along with farm vehicles that may impede traffic flow with their slower speeds and operational characteristics. Allowing these vehicles on express roads could lead to accidents and traffic congestion, negating the purpose of these routes.

The other choices represent categories of vehicles that are generally permitted on express roads due to their design for higher-speed travel and compatibility with the flow of traffic. Thus, the restriction on mopeds and farm vehicles serves to enhance overall road safety and maintain efficient traffic movement.