How would we mark a vehicle that escorts a vehicle carrying oversize freight?

1. With a “careful, oversize freight” sign on the front of the escorting vehicle.
2. The escorting vehicle will turn-on its four winkers while driving, and place a “careful oversize freight” on its roof.
3. Correct answer: With “caution oversize freight” signs on the escorting vehicle’s front and on the back of the freight-carrying vehicle, and by mounting a flashing yellow light above the driver’s compartment.
4. With a flickering light and a “careful, oversize freight” sign on the front of the escorting vehicle.

WhyThe escort vehicle carries 'Caution, oversize freight' signs at its front, the freight vehicle carries one at its back, and a flashing yellow light is mounted above the cab.