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Question:

Which of the following actions are optional when you are changing lanes?

A
Explaination

When changing lanes, you must signal, check your mirrors, and physically look over your shoulder to make sure the road is clear. Often, a motorcyclist has to evade a driver who failed to look over his or her shoulder before merging. Your car's blind spot is large enough to hide another car in the next lane. Your mirror may be clear, but the road may not be. [11.7 Changing Lanes, 11. Safe Driving Tips, Colorado Driver Handbook]