At what distance must you use your turn signal when changing lanes?

Using your turn signal at least 100 feet before changing lanes is essential for ensuring safety and clear communication with other drivers. This distance provides sufficient time for other road users, including vehicles behind you and those in adjacent lanes, to understand your intentions and adjust their driving accordingly.

Signaling at this distance helps to reduce the likelihood of accidents caused by sudden lane changes. It is particularly important on highways or busy roads where higher speeds and increased traffic density make timely communication critical. A signal also enhances overall road safety and promotes a more predictable driving environment.

While some jurisdictions might have different regulations regarding signaling distances, 100 feet is a commonly accepted standard that helps drivers maintain safe reactions and promotes courteous driving practices.