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At high speeds, you should start to signal __________ before you turn.

A 4 to 5 seconds

Always signal long enough to alert other drivers to your intentions. Under South Dakota law, you must start to signal at least 100 feet before you turn. At higher speeds, however, you should signal for a longer period, about 4 to 5 seconds. (At 45 mph, your vehicle will travel 100 feet in just 1.5 seconds.)