Final answer:
A driver should signal at least 100 feet before making a turn to provide other drivers adequate notice and to ensure safety on the road.
Step-by-step explanation:
The correct answer to the question "A driver should signal at least how far before his intended turn?" is (a) 100 feet. A driver needs to give other road users sufficient notice of their intent to turn, allowing them enough time to react and make adjustments to their driving accordingly. Signaling at least 100 feet before turning is generally the minimum distance required by law to ensure safety on the road. This distance can provide enough time for other drivers to notice the signal and anticipate the action of the turning vehicle, thereby reducing the risk of collisions.
A driver should signal at least 100 feet before his intended turn. Signaling helps communicate the driver's intentions to other drivers, pedestrians, and cyclists, allowing them to anticipate the driver's next move and act accordingly. Signaling well in advance gives everyone on the road enough time to react and adjust their own driving or walking accordingly, reducing the risk of accidents or confusion.