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‘L1' means the lane next to the centre of the road
‘L2' means the lane immediately to the left of L1
‘L3' means the lane immediately to the left of L2
‘L4' means the lane immediately to the left of L3.
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‘L1' or ‘1': means the lane next to the centre of the road
‘L2' or ‘2': means the lane immediately to the left of L1 (or 1)
‘L3' or ‘3': means the lane immediately to the left of L2 (or 2)
‘L4' or ‘4': means the lane immediately to the left of L3 (or 3).