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Semi-Truck Maximum Vertical Slope

Semi-Truck Maximum Vertical Slope

Semi-Truck Maximum Vertical Slope

(OP)
Wondering if anyone has ever come across design standards RE Maximum Vertical Slope for semi-trucks as related to parking lot movements.  Reviewing a design plan for a proposed shopping center that includes onsite access roads as steep as 18%.  Seems like this would pose potential problems for larger delivery vehicles, but not much success finding documentation on the subject.

RE: Semi-Truck Maximum Vertical Slope

(OP)
Concerned RE potential truck-trailer conflicts traversing a grade break as significant as 18% within a limited area such as a parking structure.  I spoke briefly with an industry Design Engineer who said they typically consider over-the-road design grades only, which may differ from onsite access design grade issues.  Wondering if anyone has personal experience with a design issue of this nature.  

RE: Semi-Truck Maximum Vertical Slope

18 percent is awfully steep.  Many fire department jurisdictions have 10% as the maximum allowed slope for a fire access road.

From the International Fire Code;
"D103.2 Grade. Fire apparatus access roads shall not exceed 10
percent in grade.
Exception: Grades steeper than 10 percent as approved by
the fire chief."

If the 18% is short (say less than 100%) with gradual transitions at top & bottom it may manageable.  There was a recent post with reference to the Green Book, a section on allowable slopes vs. length for trucks.

RE: Semi-Truck Maximum Vertical Slope

(OP)
Thanks for the input Carl.  That confirms some of the verbal feedback I have received from a few others I have spoken with.

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