A car may drive on the **shoulder** in **emergency** situations when it cannot maintain the appropriate speed for the road due to a **breakdown** or **accident**. In these cases, if the vehicle is still operational but cannot reach the necessary speed, it must drive on the right shoulder to avoid obstructing traffic. If there is no shoulder, it should position itself as far to the right as possible on the road. This is important to ensure traffic safety and flow, allowing the vehicle to be removed from the main road without causing problems for other drivers.

Additionally, on highways and expressways, if a vehicle has to drive more slowly due to a breakdown, it must exit the road at the first available exit. If the vehicle must stop due to an emergency, it should do so on the shoulder or in the median, and not in the traffic lane. This helps to minimize the risk of additional accidents and facilitates roadside assistance.