What are you required to do when approaching a railroad barrier in a “down position” (meaning: horizontal)?

1. Continue driving carefully around or under the barrier.
2. Stop and turn the vehicle’s engine off.
3. No parking and stopping. Pass the barrier from its right.
4. Correct answer: Stop before it and do not continue driving.

WhyA lowered barrier means stop before it and do not continue until it is raised. You may not drive around it on either side.