4 Sep 07 12:08
I did some field work with a smart level. Here are my field notes followed by some comments:
September 4, 2007 7:26 a.m.
7601 E Main ne corner, cross 8% lay notice, door will hold @ notches not heavy
Drive Entrance break 9.2%(6')+9.2%(long), scary, but no scrape
7715 E Main, cross 7.5% back, 9.6% front, very noticeable feel and look, doors somewhat heavy but hold at notches, unassisted close, unassisted open halfway.
9% down forward, no door trouble, seems steep for clutch & tran
The main disadvantages of the tested slopes seemed to be
-18.4% drive entrance grade change was scary and my Honda Accord probably would have scraped bottom if the short side of the break (the sidewalk) were much wider than 6'
-Parking slope of 9% seemed a little much in the forward direction due only to clutch/transmission awareness, though there was no real absolute "problem".
-Parking cross slopes I tested are in the gray area where doors could possibly barely skip over their stops and gently tap neighboring cars on their own, but possibly no more likely than a hurrying and insensitive person to cause damage on a flat space.
Just because I have 15 years experience avoiding such steep slopes, I will probably still not exceed 8%, especially since at that slope a lot of elevation can be covered quickly.
I hope this is helpful.