Typically, passengers are not allowed to ride in trailers, period. In the case of an 18 wheeler, I don't believe the FMCSR covers it, although state law would. Even if a particular state had no law against it, no trucking company is going to allow it, namely because of the liability involved, especially in the case of a loaded trailer, where the risk of falling objects is present.
There are times that exceptions may be made to this law - a somewhat famous photograph taken during the blackout in NY shows a Swift flatbedder hauling pedestrians across the George Washington Bridge. New York authorities did not cite the driver, and the city of New York even thanked the driver - however, the company fired the driver for it.
A pup trailer is a trailer which is being pulled behind another trailer.
General inexperience in driving - inattention to the operation of their vehicle or being distracted by other passengers or ESPECIALLY electronic communication devices.
Soldiers and their families were being carried as passengers on the Birkenhead.
no
No, no one can ride in any sort of trailer while it is being towed.
The king was being unfair to them
Of what commodity and what type of trailer? 25 - 40 in a dump trailer, depending on trailer wall heights and weight in relation to the commodity being hauled.
49 out of 50 states have a 41 ft. bridge between the drives and trailer tandems. California, being California, has a 40 ft. bridge between the drives and trailer tandems.
No, but it will be soon!
They are being used by aircraft landing and leaving and passengers and cargo coming in and going out.
The average length of a standard tractor trailer is 70 feet in all, the trailer itself being 53 feet in length. Most flatbed trailers are 48 feet long.
Not while they are being driven.