worst U.S. interstates, due to terrain
I have to agree strongly with Interstate 68 through Cumberland, Maryland. That is a cluster -- you drop from 70 MPH and make a hard 40 MPH left turn after descending a steep hill. Then throw in a bunch of city traffic merging on and exiting the interstate. It's so bad they've built massive concrete walls, so that when big rigs crash, they won't hopefully burn all of the downtown.