Final answer:
The correct guideline for signaling your intent to turn is to do so at least 100 feet before the turn to ensure the safety of all road users, including pedestrians.
Step-by-step explanation:
When it comes to signaling your intent to turn, the most common guideline is to signal at least 100 feet ahead of where you plan to make your turn. This distance gives other drivers and pedestrians adequate notice of your intentions, allowing for safer navigation and coordination on the road. Signaling ahead of time is particularly critical for pedestrian safety, as those on foot need to be aware of turning vehicles to prevent accidents, especially at busy intersections. Furthermore, a traffic signal at intersections can help in managing vehicle speed and improve safety by ensuring vehicles do not speed through and by providing pedestrians with an appropriate time to cross, therefore reducing the possibility of accidents.