02-13-2009, 10:43 AM
Russ Bellinis Wrote:Josh, don't worry about a grade being too steep for an on ramp or off ramp. Highway planners are not nearly as restricted as railroad engineers. 4.5% is considered too steep for mainline operation, although Cemex has a grade that steep between the quarry and the mill in Victorville. The "Grapevine" (I-5 between Gorman and Wheeler Ridge) has a 6% grade that is probably 6 miles long if I remember correctly. There is a 9% grade coming out of the town of Wrightwood West of Cajon Pass down Lone Pine Canyon. I think I have seen ramps as steep as 13%-14% in some of the hilly areas of Los Angeles County. I don't know what the grades are in San Francisco streets, but some like Davisidero look almost vertical.
LOL yes that is very true Russ, thanks
I think i wont be so concerned about making the grade for the overpass over to the left shelf now. Plus i only have about 3'6"' for it to come down 5-1/2" lol I might even have to add a small 6" extension off that shelf to allow trucks and cars to get off that overpass/ramp lol