## Dual carriageways 

A dual carriageway is a road which has a central reservation to separate the carriageways. 

137. On a two-lane dual carriageway you should stay in the left-hand lane. Use the right-hand lane for overtaking or turning right. After overtaking, move back to the left-hand lane when it is safe to do so. 

138. On a three-lane dual carriageway, you may use the middle lane or the right-hand lane to overtake but return to the middle and then the left-hand lane when it is safe. 

139. Climbing and crawler lanes.  These are provided on some hills. Use this lane if you are driving a slow-moving vehicle or if there are vehicles behind you wishing to overtake. Be aware of the signs and road markings which indicate the lane is about to end. 

140. Cycle lanes.  These are shown by road markings and signs. You MUST NOT  drive or park in a cycle lane marked by a solid white line during its times of operation. Do not drive or park in a cycle lane marked by a broken white line unless it is unavoidable. You MUST NOT  park in any cycle lane whilst waiting restrictions apply. 

Law RTRA sects 5 & 8 

