Any? How 'bout "lots and lots". Try Route 40 through the central-to-west part of the state, it's very hilly. And anywhere in the Pittsburgh area is hilly, though not too cliffy. Wouldn't be fun to drive off but you wouldn't drop more 'n fifteen feet. Heck, there's a spot or two a mile down from my folks' house that wouldn't be fun to go off in winter. Two roads going steeply downhill, that cross in an "X" shape; the right-hand road is a real killer.
Yay for plotting! I have the characters, the important ones anyway, and the tension; the relationships, and a vague plot. Ack. It'll be great fun. I love this heroine, she's terribly obnoxious and competent.
Sorry, "Route 30", not 40.
Pittsburgh is perfect ... it's Western Pennsylvania, which is ideal.
Have you ever been to Punxsutawney?