You should drive on the shoulder to pass a car only:

Driving on the shoulder to pass a car is considered unsafe and generally illegal, as it can lead to dangerous situations for both the driver and others on the road. The shoulder is typically meant for emergencies, breakdowns, or situations where a vehicle needs to pull off the roadway.

Using the shoulder to overtake another vehicle can create confusion and increase the risk of collisions, especially if other drivers are not expecting a vehicle to be there. Additionally, shoulders are often dirtier or less maintained than the main roadway, which can adversely affect vehicle control.

Understanding this helps reinforce the importance of adhering to safe driving practices and following the rules of the road to ensure everyone's safety. The only appropriate time to use the shoulder is for emergencies, making it crucial for drivers to remain patient and allow for safe and legal opportunities to pass other vehicles when conditions permit.