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When is it illegal to pass a vehicle?

  1. On a single lane highway

  2. On the right side of the road

  3. On a two lane highway

  4. On the left side of the road

The correct answer is: On the left side of the road

Passing a vehicle is considered illegal when it is done on the left side of the road. This is because passing on the left requires crossing over into oncoming traffic, which can be dangerous and increase the risk of accidents. Options A, B, and C are incorrect because they do not specify passing on which side of the road is illegal. Passing on the right side or on a single or two lane highway may be legal under certain circumstances, such as when there is a designated passing lane or when there is no oncoming traffic. It is important to follow all traffic laws and signs when deciding to pass a vehicle.