Actually, I'd recommend staying away from Route 1 (in northeastern Massachusetts) period. 1A is OK, but 1 really isn't. There are nice sections of 133 (including the section that I've ridden with Robyn), but there are also sections that I'd rather not ride.

And then as you move to the north and east... 1A in New Hampshire is fine, although the section going through Hampton Beach is overcrowded in the summer, should be fine now. But I'd still stay off of 1 with my bike.

--- Denise