It's like a garden hose flopping around. It shoots through the gap in the mountains and wavers back and forth. Three Mile Hill between exits 8 and 7 provides lift so when you get to the top at exit 7 driving conditions are often much worse than at exit 8. From 7 all the way to exit 4 consistently has the worst driving conditions. Of course the elevation gets up to 1800' so that contributes too.