 Interstate 15 begins at Interstate 5 in Southeast San Diego near the 32nd Street Naval Station, then heads northeast to the Inland Empire and then Las Vegas.Public bikeways in San Diego County consist of Class 1 bike paths, which are separate from the public roads, Class 2 bike lanes, which are demarcated space on the roadways designated to be used primary by bicyclists, and Class 3 bike routes, which are regular surface streets designated as being particularly attractive to bicyclists.SANDAG publishes a map which shows all of these bikeways in the greater San Diego Metropolitan area annually, and it is available at most local bike shops.