Originally Posted by Paul L.
[edit] Truck speed limit differentials
The following states have different statutory speed limits for cars and trucks.
State Statutory car speed limit Statutory truck speed limit
Arkansas 70 65
California 70 55
Idaho 75 65
Illinois 65 55
Indiana 70 65
Michigan 70 60
Montana 75 65
Ohio 65 65 on Ohio Turnpike, 55 on all other freeways.
Oregon 70* never implemented, 65 or less still in effect[72] 5 mph differential, effectively 60[73] although 55 is still posted in most locations
Texas 70-80 mph day/65 mph night 70 day/65 night
Texas (Farm-to-Market roads only) 70 mph day/65 mph night 60 day/55 night
Washington 70 60
(and this is just the tip of the iceberg for commercial vehicles)
Chaos reigns supreme!
(Incidentally Motorcyles also have different rules in many states as covered in another thread)
The lower speed limits for large vehicles than for passenger cars make absolutely no difference in how these vehicles are maneuvered. There is no law requiring passenger cars to always be driven faster than the truck speed limit. Passenger cars are allowed to be driven considerably below the limit, think of that, and nobody claims that the drivers of these passenger cars are not driving in the vehicular manner, in accordance with the rules of the road for drivers of vehicles.