What is a requirement for the functionality of doors in a vehicle?

The requirement for the functionality of doors in a vehicle is that the driver and front passenger doors must open from both the inside and outside. This is crucial for safety and accessibility. In the event of an emergency, such as an accident, it is important that both the driver and front passenger can exit the vehicle quickly and easily. If the doors could only be opened from one side, it could pose a serious risk to the occupants. Furthermore, this feature ensures that passengers can enter and exit the vehicle comfortably, enhancing the overall usability of the vehicle.

This requirement is part of regulations to promote safety and is intended to minimize the risks associated with vehicle entry and exit.