All roads that allow bikes (pretty much anything except a highway) are safe for biking because they don't have minimum speed limits and you should always be pre

All roads that allow bikes (pretty much anything except a highway) are safe for biking because they don't have minimum speed limits and you should always be prepared to stop. At least, that's the case in states that have laws like Massachusetts that say "There is no law that requires bicycles to ride as far to the right as practicable". It may be different for your state though.