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What must you do before entering a highway?

  1. Look over your shoulder

  2. Make a complete stop

  3. Increase your speed

  4. Yield to oncoming traffic

The correct answer is: Yield to oncoming traffic

Before entering a highway, you should yield to oncoming traffic. This means you must stop if necessary and wait for a safe gap in traffic to merge onto the highway. Looking over your shoulder can help you check for any cars in your blind spot, but it is not the most important step in entering a highway safely. Making a complete stop is not necessary unless there is a stop sign or traffic light at the entrance to the highway. Increasing your speed before merging onto the highway is dangerous and can cause accidents. Therefore, yield to oncoming traffic is the most important action to take before entering a highway.