Looks like Mount Davis.
Can't be too steep if a T can descend in top gear.
I wonder when this pic was taken. Looks like it says "CEG 19" in the right corner as in 1919. I would think it is later as it seems pointless to warn drivers of the world's most popular car to use second (high), gear. I agree it can't be that steep as there is a T climbing to the top. My car seems to have equal ability and limitations up or down hill.
Thought this might be of interest to the history buffs among us.
Howard Dennis
http://www.baltimoreorless.com/2011/02/negro-mountain-history/