Which of the following is true about vehicles displaying a diamond-shaped sign that indicates a hazardous load?
- They are not allowed to drive on freeways.
- They must stop before crossing railroad tracks. ✓
- They are not allowed to exceed 35 mph.
Answer: B. They must stop before crossing railroad tracks.
Vehicles displaying a diamond-shaped hazardous-load sign must stop before crossing railroad tracks.
Why this is the answer
The handbook explains that a diamond-shaped sign on a truck warns that the load may be dangerous, such as gas or explosives. It then gives a specific rule for these vehicles: they have to come to a stop before going over railroad tracks. That rule is why the railroad-track stop is the correct statement here. The passages do not set a freeway ban or a special 35 mph cap for these vehicles, so the other choices are not supported.
Why the other answers are wrong
- A. They are not allowed to drive on freeways. — The passages say nothing about barring vehicles with hazardous-load signs from freeways, so this choice adds a restriction that is not in the handbook.
- C. They are not allowed to exceed 35 mph. — The handbook gives no special 35 mph limit for vehicles with hazardous-load signs; the speed-limit material in the passages does not support this choice.
Remember it
Picture the diamond as a warning that the truck must make a stop at tracks, not as a speed-limit badge.