The only vehicles that are allowed to back up on freeways and expressways are
Correct answer
- slow-moving farm equipment.
- tractor-trailers.
- motorcycles.
Explanation
Backing up is not allowed on freeways or expressways except by drivers of emergency vehicles in the line of duty. If you try to back up on a freeway on which there are vehicles traveling at 75 mph (110 feet per second), you will have a high risk of being hit from behind by an approaching vehicle.
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