(87/194) You are behind a long vehicle (7.5 m or more in length) that is signalling and starting to turn left. The truck is displaying a Do not overtake turning vehicle sign and is in the second lane from the left side of the road. You also want to turn left. What must you do?

You are behind a long vehicle (7.5 m or more in length) that is signalling and starting to turn left. The truck is displaying a Do not overtake turning vehicle sign and is in the second lane from the left side of the road. You also want to turn left.  What must you do?