Other institutions include the University of Nevada School of Medicine, with a campus in the city, and the for-profit private school Le Cordon Bleu College of Culinary Arts. Educational opportunities exist around the city; among them are the University of Nevada, Las Vegas and Nevada State College run by the Nevada System of Higher Education, Desert Research Institute, The International Academy of Design & Technology Las Vegas and Touro University Nevada. Las Vegas is served by 22 television and 46 radio stations. The area is also served by two NOAA Weather Radio transmitters (162.55 MHz located in Boulder City and 162.40 MHz located on Mount Potosi). RTC Transit is a public transportation system providing bus service throughout Las Vegas, Henderson, North Las Vegas and other areas of the valley. Inter-city bus service to and from Las Vegas is provided by Greyhound, BoltBus, Orange Belt Stages, Tufesa, and several smaller carriers. Amtrak trains have not served Las Vegas since the service via the Desert Wind was discontinued in 1997, but Amtrak California operates Thruway Motorcoach dedicated service between the city and its passenger rail stations in Bakersfield, California, as well as Los Angeles Union Station via Barstow. The Union Pacific Railroad is the only Class I railroad providing rail freight service to the city. Until 1997, the Amtrak Desert Wind train service ran through Las Vegas using the Union Pacific Railroad tracks. A bus rapid-transit link in Las Vegas called the Strip & Downtown Express (previously ACE Gold Line) with limited stops and frequent service was launched in March 2010, and connects downtown Las Vegas, the Strip and the Las Vegas Convention Center. In 2016, 77.1 percent of working Las Vegas residents (those living in the city, but not necessarily working in the city) commuted by driving alone. About 11 percent commuted via carpool, 3.9 percent used public transportation, and 1.4 percent walked. About 2.3 percent of Las Vegas commuters used all other forms of transportation, including taxi, bicycle, and motorcycle. About 4.3 of working Las Vegas residents worked at home. In 2015, 10.2 percent of city of Las Vegas households were without a car, which increased slightly to 10.5 percent in 2016. The national average was 8.7 percent in 2016. Las Vegas averaged 1.63 cars per household in 2016, compared to a national average of 1.8 per household. With some exceptions, including Las Vegas Boulevard, Boulder Highway (SR 582) and Rancho Drive (SR 599), the majority of surface streets in Las Vegas are laid out in a grid along Public Land Survey System section lines.