People in **wheelchairs** can travel on a road, but they must follow certain rules:

- **Passable shoulder**: If the road has a shoulder that can be used, people in wheelchairs must travel there. The shoulder is the part of the road that is next to the main lanes and is used for slower or special vehicles.

- **Roadway**: If there is no shoulder or it is not passable, people in wheelchairs can travel on the roadway, but only using the essential part of the lane. This means they must occupy as little space as possible to avoid interfering with the main traffic.

It is important to remember that people in wheelchairs cannot travel on **motorways or expressways**, as these roads are reserved for faster vehicles and do not allow access to vehicles for people with reduced mobility.