Under what condition must you use your turn signal when parking?

Using your turn signal when parallel parking is essential for several reasons. When you signal, you are alerting other drivers and pedestrians of your intention to park, which helps maintain safety on the road. This is particularly important because parallel parking often involves maneuvering your vehicle into tight spaces, and being clear about your intentions can prevent misunderstandings that might lead to accidents.

In addition, using your turn signal aligns with safe driving practices and the rules of the road. When you signal before executing the parking maneuver, you contribute to a predictable flow of traffic, allowing other road users to adjust their actions accordingly. This can be especially critical in urban areas or locations with high traffic, where sudden movements can lead to dangerous situations.

While it's true that signaling may not be specifically required in every parking situation or until you are actually parked, doing so when parallel parking is a best practice that enhances overall road safety.