How feasible is it to convert existing shoulders that are already decently wide (4 ft+, preferably 5 ft+)into bike lanes? Speaking as a layman, it seems like for the most part all it would be just a matter of adding bike lane stencils and arrows. Of course, more work would be needed at right-turn lanes and such, but overall it would seem that the cost for such conversion would be really low. And such a conversion can induce more bike traffic, and get car drivers to look out for bikes more. Am I missing something?