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Question:

On a multilane roadway with a speed limit of 50 mph or greater, you must signal your intention to change lanes ________ in advance.

A at least 300 feet
Explaination

On a multilane roadway with a speed limit under 50 mph, you must signal your intention to change lanes at least 200 feet in advance. If the speed limit is 50 mph or greater, you must signal your intention at least 300 feet in advance. Note that at 50 mph, your vehicle will travel 300 feet in about 4 seconds.