TURNS
LANE CHANGES
BUSINESS / RESIDENTIAL
STOP INTERSECTION
THROUGH INTERSECTION
EXPRESSWAY
CURVE
ROADSIDE STOP
THREE-POINT TURN
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Signal: Late or never

You must signal early on the entrance (acceleration) ramp so that those already on the expressway can see you and perhaps have a chance to move over to make a space for you to merge. A late signal would be a minor error and failing to signal could cause a failure.