Questions: When is it legal to pass on the shoulder? When the car in front of you is stopped and preparing to turn left. When accelerating after turning right. When allowing others to pass you. All of the above.

The answer is the first one: When the car in front of you is stopped and preparing to turn left.

Explanation for each option:

1. When the car in front of you is stopped and preparing to turn left.

   • This is generally legal in many jurisdictions because it allows traffic to continue flowing. The shoulder can be used to pass a vehicle that is stopped and waiting to make a left turn, provided it is safe to do so and there are no signs prohibiting it.

2. When accelerating after turning right.

   • This is typically not legal. The shoulder is not meant for acceleration after a turn; it is intended for emergency stops or specific situations like the one mentioned in the first option.

3. When allowing others to pass you.

   • This is also generally not legal. The shoulder should not be used to allow others to pass, as it can create dangerous situations and is not its intended use.

4. All of the above.

   • Since options 2 and 3 are not typically legal, this option is incorrect.

Summary: It is legal to pass on the shoulder when the car in front of you is stopped and preparing to turn left, provided it is safe and there are no prohibiting signs.