To enter or exit a vehicle on an urban road, it is advisable to do so **on the side of the road where the vehicle has been immobilized**. This is due to several safety reasons:

- **Proximity to the edge of the road**: Vehicles must drive as close as possible to the right edge of the road. When parking, it is likely that the vehicle is near the edge, which makes it easier to enter or exit on that side without invading the road and exposing oneself to traffic.

- **Safety when opening the door**: When opening the vehicle door, it is important to maintain a safe distance from other vehicles in circulation. Opening the door towards the road can endanger the occupants and other road users, especially if it is opened towards moving traffic.

- **Avoiding the blind spot**: When exiting the vehicle, it is crucial to be out of the blind spot of other vehicles. Exiting on the side of the road where the vehicle has stopped minimizes this risk, as it avoids direct exposure to traffic that might not see a person exiting the vehicle.

For these reasons, it is always safer to enter or exit the vehicle on the side of the road where it has stopped, thus ensuring greater protection for all road users.