Business Insider/Eugene Kim US Route 101 is the highway that connects Silicon Valley with San Francisco. The highway itself is no different from any other road, but there’s one major difference: weird billboards. Sure, you'll find the standard fast food joint or car dealership signs along the way, but most of the billboards are served up by tech companies you've probably never heard of. We recently took a drive up the 101 to see what companies advertise on Silicon Valley's busiest highway.Here's a map of US 101.