Is it safe to open car doors into traffic?

Opening car doors into traffic is considered dangerous primarily due to the risk of causing accidents and injuries. When a car door is opened into a lane where other vehicles are passing, it can obstruct the path of approaching cars or bicycles, leading to potential collisions. Drivers and passengers should always ensure that it is safe to exit the vehicle, particularly in traffic, to avoid putting themselves and others at risk.

While checking mirrors may provide some awareness of the surrounding traffic, it does not guarantee safety, as situations can change rapidly, and other vehicles may be moving closer than anticipated. Also, parking out of the lane offers a safer option, but it does not apply if the door is opened into an active traffic lane. Therefore, the safest practice is to avoid opening doors into traffic altogether.