In many Cases While driving, You may see a gap or space in the Road on the map...Like while driving in Guaymas, There is a gap in the road...

That gap signals an unmarked road that leads to the Service Station just off to the East of the Yellow dot that markes the City(the service/fuel station between Guaymas and Chihuahua) Also, Just South Of Denver on the Yellow marked 2-lane Road..If you look carefully on the map is another gap...

That road runs east-west....It takes you Through Area 51 and eventually jions with the other 2-lane Highway running paralell to it going south from Salt Lake City. This road also leads to a service Station. I have seen only one exception to this pattern...

If you are driving Through Los Angeles There is a 2 lane road Just inside City map limits...( it eventually joins Hiway 101 and runs Paralell to Interstate 5).this road does NOT lead to any marked of unmarked roads.