1- you know what doesnt have high traffic or high speeds? gravel roads. blissful riding right there. All the hulls and wind you can stand, with little to no traffic.
2- with the team of youth i help mentor, we ride some country highways where the speed is 55 and its 1 lane each way without a shoulder. Cars almost always give us a wide berth, but I think thats because the collective 30-50 of us are usually spread out over a couple miles so once the vehicle comes upon the first group, they then see many groups over and again. Safety in numbers, I guess.
3- riding a high traffic 1 lane highway with no shoulder doesnt sound fun. Not sure if this road is high traffic or not, but just in general- that doesnt sound like fun.