When Spring comes, he'll make his way to San Fran 'Bay area' and Silicon Valley where he can ride a 'pan flat' route up and down El Camino Real and round onto the east side of the bay in superb weather every day until Christmas.
That would be the end of his attempt. Traffic lights every 100 yards from SF to south of San Jose and east bay normally seems even more crowded. Not to mention dozy denizens of the valley constantly turning right across you.
(I once tried to ride all that road. Once. Back in 2009. Got so damn bored stopping at all the lights I eventually decided to take a random turn. Ended up in Santa Cruz mountains. Discovered mountain climbs are fun. Entered La Marmotte a few weeks later, and Mille Cymru a few weeks after that. Yep, El Camino Real has a lot to answer for!)
99% of USA must be less densely populated than the Silicon Valley.