1. A circular intersection in which traffic flows continuously

2. To pass another vehicle

3. A temporary route due to roadworks or an obstruction

4. An emergency stopping area at the side of a road

5. A potential danger on the road

6. A tunnel or passage that allows vehicles to pass underneath

7. A line or queue of vehicles on the road

8. A section of a road marked for a single line of traffic

9. The central reservation area between opposite lanes of traffic

10. A way out or off from a road

11. Rate of motion

12. An inclined lane providing access to or from a motorway

13. The hard surface of a road

14. Blending into traffic from another road

15. Facilities available along the motorway like fuel stations or rest areas

16. An underground passage for road traffic

17. Symbols or words used to convey information to drivers