We had the misfortune of having to travel through Conway and North Conway last weekend. It took us almost 2 hours, to get through the few miles of highway 16 which goes through these towns. The towns have done nothing to mitigate traffic congestion. On the return trip, it took well over 90 minutes.
I have no idea what the traffic is like on weekdays, but I sure would avoid these towns during tourist seasons of summer and fall.