I-40 Eastbound from Crab Orchard MM 340 to Harriman Exit # 347 is all down the mountain driving with a 5 % grade and winding highway. The speed limit for 18 wheelers is posted at 55 M.P.H. and cars 60 M.P.H. The Tn. Highway Patrol patrols this area pretty heavy account many 18 wheeler accidents they will sit on the side of the highway on the curves and by the time you see them it’s to late.