Final answer:
Driving on the shoulder to pass another vehicle is illegal and unsafe in most situations. The shoulder is intended for emergencies and emergency vehicles, not for overtaking. The correct answer is 'Under no circumstance' because it maintains road safety and adheres to traffic laws.
Step-by-step explanation:
You should drive on the shoulder to pass a car only under specific circumstances that are dictated by traffic laws which vary by location. However, in general, driving on the shoulder is considered illegal and unsafe. The shoulder of the road is typically reserved for emergencies, stopped vehicles, or as a lane for emergency vehicles. It is not intended for regular traffic use or for overtaking other vehicles.
In some of the scenarios provided, such as when a vehicle ahead of you is turning left or if traffic is heavy, it may be tempting to use the shoulder to continue your journey. However, these conditions do not legally justify driving on the shoulder. Options like 'If the vehicle ahead of you is turning left' and 'If traffic is really heavy and your turn or exit is in sight' may seem practical, but they are typically not legal or safe practices. The shoulder must be left clear for emergency situations.
The correct option for when you should drive on the shoulder to pass a car is:Under no circumstance. Using the shoulder to pass another vehicle is not only dangerous but is also against traffic regulations in most situations. Doing so can cause collisions, especially if stopped vehicles or pedestrians are using the shoulder for emergencies.
Additionally, driving behavior often changes when drivers are aware they are being watched, such as by a police vehicle. But regardless of whether someone is watching, the rules of the road should be followed at all times for the safety of all road users.