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Question:

To make safe and legal turns, you must signal your turn at least

A 100 feet ahead on city streets and 300 feet ahead on open highways.
Explaination

To make safe and legal turns, you must signal your turn at least 100 feet ahead on city streets and 300 feet ahead on open highways. (Note that at 65 mph, a vehicle will travel 300 feet in just 3.1 seconds.)