Here are the instructions to the trailheads from I-90 (modified by me to work better):
1. Take MA exit 2 towards US-20, keep left towards US-20 / RT-102
2. Turn left onto US-20 and then right to RT-102
3. Keep straight onto US-7 South and stay on US-7 South
5. Turn right onto SR-41 South (not North)
6. Turn left to stay on SR-41 South and then immediately to the right onto Mt Washington Rd.
7. Continue straight (road name changes to East Street at some point). You pass the Forest Headquarters (on your right), then the road becomes unpaved. Keep going until you see a large parking area and the AMC sign on your left. The first trail (red blazed over Round Mountain and Mt Frissel) starts from the right. A stone state line marker is reported to be here as well although we never saw it
8. Go 1.2 mile past the AMC parking area until you see a small parking area on your right. There is a 2nd small parking area immediately after it that has a metal gate back and to the right (which you cannot see until you stop and look backwards). This is the jeep road that you want to follow. If you hit a lake on the right you went to far. Turn around and go back 2 miles to the parking area.
Thanks for the information. I have edited the main page accordingly. So Nevada, Connecticut, AND Oklahoma's highpoints are shoulders of higher terrain in other states. I guess a person learns something new everyday.