How many seconds in advance should the car turn signal be turned on?

[SaraAnn]

Car turn signals should be activated 10-20 seconds in advance. Here is more information: 1. Activate turn signals in advance. When preparing to turn, turn on the signal early to give following drivers sufficient reaction time. However, the exact timing may vary depending on road conditions, traffic situations, and vehicle speed, but generally should not be less than 10 seconds. 2. Definition of turn signals. Turn signals are warning lights that alert surrounding vehicles and pedestrians to yield when a motor vehicle is turning. When activated, these lights flash repeatedly to attract attention and prevent traffic accidents.