In slow-moving traffic. You should

  • reduce the distance between you and the vehicle ahead to maintain traffic flow
  • never get so close to the vehicle in front that you cannot stop safely
  • leave enough space to be able to manoeuvre if the vehicle in front breaks down or an emergency vehicle needs to get past
  • not change lanes to the left to overtake
  • allow access into and from side roads, as blocking these will add to congestion
  • be aware of cyclists and motorcyclists who may be passing on either side.
Rule 151: Do not block access to a side road
All Highway Code Rules | My Saved Highway Code Rules