Motorways

• What colour studs mark the lanes or the middle of the road?

  White
• What colour studs mark the left edge of the road?

  Red
• What colour studs mark the central reservation of the motorway or carriageway?

  Amber
• What colour studs mark the edge of the carriageway by slip roads and lay-bys?

  Green
• How do smart motorways prevent traffic bunching?

  By using variable speed limits
• You're driving on a motorway. What does it mean if the car in front shows its hazard warning lights for a short time?

  Traffic ahead is slowing or stopping suddenly