The height of most tractor trailer trucks is between 13 1/2 and 14 feet. Low-clearance vehicles can only drive on certain roads in some states, and they have to follow certain rules.
There are no federal rules about the height of a tractor trailer, unlike the length and width. For this part, each state can make its own rules. In terms of other measurements, the width can be no more than 8 1/2 feet. The length of a trailer must be at least 48 feet long. There are some exceptions to this rule, such as tractor trailers that have been “grandfathered” in their own states.