Final answer:
Turn signals should be activated about 100 feet prior to turning in city driving, or at least five seconds before the maneuver, which varies based on speed, to ensure traffic safety.
Step-by-step explanation:
When operating a motor vehicle, it is essential to be proactive about signaling your intentions to other drivers to maintain road safety. As per standard driving practices, it is advised that the turn signals should be activated approximately 100 feet before making the turn or change in direction in city driving. On highways or at higher speeds, this distance should be increased to give other drivers more time to react. It should typically be long enough to signal at least five seconds before the actual maneuver, depending on your speed. This ensures that other motorists and pedestrians understand your intentions and can prepare accordingly, promoting overall traffic safety.