Parking Lot Design - Incline 1

[privateer]

What is the maximum incline that a parking lot (stalls) could be designed to?

We are considering a parking lot on some very hilly ground, and need to know the maximum angle for a stall. For instance, if the incline is too steep, people won't be able to open there doors, but we want to preserve as much of the natural slopes (hills) as possible.

I've done dozens of parking lots, but all on flat ground....

Thanks.

 

[TEEI]

Generally 4% is considered to be steep. But I have seen 6%-8% in the most rare situations.

 

[ACtrafficengr]

I'd stay away from steeper grades in areas that get icy weather, for the sake of handicapped/infirm/leather-soled-shoed pedestrians.

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"...students of traffic are beginning to realize the false economy of mechanically controlled traffic, and hand work by trained officers will again prevail."

Wm. Phelps Eno, ca. 1928