The specific case is New Jersey, Squankum Rd rte 524 between Hurley Pond rd and the town of Farmingdale. But in the area, there are other cases where there is a useful shoulder on one side of the road and not the other. In this case, the shoulder would be wide enough to accommodate bicycle traffic in 2 directions, if it were so marked.
Just in case some asks, I don't like the traffic on Belmar Blvd., which goes directly into Farmingdale.
2000 Montague CX, I do not recommend it, but still ride it.
Strida 3, I recommend it for rides < 10mi wo steep hills.
2006 Rowbike 720 Sport, I recommend it as an exercise bike.
1996 Birdy, Recommend.
Wieleder CARiBIKE (folding), decent frame.