You must indicate your intention to turn at least _____ before turning?

The requirement to indicate your intention to turn at least 100 feet before making a turn is designed to enhance safety on the road by providing adequate notice to other drivers and pedestrians of your maneuver. This distance gives other road users a reasonable amount of time to react to your intention, maintain safe spacing, and adjust their actions accordingly. Signaling at this distance ensures clarity and promotes safer driving environments, therefore, reducing the risk of accidents.

The other distances, while they may seem reasonable as well, do not meet the standard established for safe signaling practices in many jurisdictions including Alaska. Signaling too late, such as within 50 feet, would not give sufficient warning to those who could be affected by your turn, potentially leading to confusion or collisions.