Illinois IDOT Class B Non CDL Permit Practice Test

The overall length limitation for truck tractor-semitrailer combinations on non-designated local streets and highways is set at 55 feet. This regulation is in place to ensure the safe operation of larger vehicles within local roadways that may not be designed for the maneuvering and turning radius required by longer combinations.

Local streets and highways often have more restrictions compared to interstate highways, where longer combinations may be permitted to accommodate the design of major roadways. Limiting the length to 55 feet helps to minimize the risk of accidents, reduces wear on infrastructure, and facilitates better traffic flow in more congested or narrower areas. Even though some longer vehicle configurations are allowed on designated highways, local roads – which may have different conditions and safety considerations – require stricter limitations.