How much traffic is there on SR 89A? It can be quite peaceful and safe or extremely nerve-wracking. The worst kind of road to bike on is a fast narrow country road with only one lane in each direction and a constant stream of traffic both ways. Even half a mile might seem long under those conditions. However, if there is not much traffic, it can be a nice option.

How many interchanges/merges/diverges do you have to cross on the interstate and how busy are they generally?