At what distance should you signal before turning or changing lanes?

You should signal at least 100 feet before turning or changing lanes. This distance provides adequate time for other drivers and pedestrians to notice your intentions, which is crucial for maintaining safety on the road. Signaling well in advance ensures that surrounding traffic can react appropriately, helping to prevent accidents. This practice is not only a legal requirement in many states, including Montana, but also promotes good driving etiquette by maintaining clear communication with other road users.

While other distances are also suggested in various contexts, 100 feet is the standard that balances visibility and reaction time effectively, allowing for safer maneuvers. Signaling less than this distance may not give enough time to alert others, potentially leading to confusion or dangerous situations.