Thanks for all the advice! I like the saftey triangle idea. I think I'll throw a couple of 'em in my panniers. Legal or not, I'll let the cops come stop behind me and put on thier flashy lights if they have a problem.
As for courage, I'm not sure I'm well stocked in that area. It was scary the first few times I did it, just like it was scary the first few times I rode on a 55mph two-lane road. After that, its just pretty. In the morning on the ride in, I rarely get passed by more than 10 cars. Its not so much overtaking cars that I worry about, its people popping out to pass slow trucks and busses coming the other way. I keep a sharp eye and say a little prayer.
Fortunantley, its a small town on my side of the bridge, and I know many of the people that pass me every day. I think if I broke down, I would have a good chance of getting a ride in the back of a pick-up truck.