Trailer swing clearance
Did you ever think that there is more to clear than just the trailer to cab or sleeper? If you draw a straight line from kingpin to any object you can see if clearance exists. But does that margin remain constant as the combination turns a corner? If your geometry teacher was good about application, you would know that this is where the Pythagorean Theorem comes into play. A-squared plus B-squared equals C-squared. Sure, we all recall the rhyme, but how does that apply to a truck?