7.Multi-lane carriageways  Lane discipline  Single carriageway  highwaycodeuk.co.uk 72  ● use the middle lane only for overtaking or turning right.  Remember, you have no more right to use the middle lane  than a driver coming from the opposite direction  ● do not use the right-hand lane.  133. If you need to change lane, first use your mirrors and if necessary take a quick sideways glance to make sure you will not  force another road user to change course or speed. When it is safe  to do so, signal to indicate your intentions to other road users and  when clear, move over.  134. You should follow the signs and road markings and get into the  lane as directed. In congested road conditions do not change lanes  unnecessarily. Merging in turn is recommended but only if safe and  appropriate when vehicles are travelling at a very low speed, e.g.  when approaching road works or a road traffic incident. It is not  recommended at high speed.  135. Where a single carriageway has three lanes and the road  markings or signs do not give priority to traffic in either direction  136. Where a single carriageway has four or more lanes, use only the  lanes that signs or markings indicate. 