Vermont has five colleges within the Vermont State Colleges system, University of Vermont (UVM), and several other private, degree-granting colleges, including Bennington College, Champlain College, Goddard College, Middlebury College, Saint Michael's College, the Vermont Law School, and Norwich University. Transportation The Vermont Agency of Transportation (VTrans) is responsible for Vermont's transport infrastructure. The principal mode of travel in Vermont is via motor vehicle, with 94.3% of Vermont households owning a car in 2008. Four car ferry routes operate across Lake Champlain. Passenger rail is provided by Amtrak's daily Vermonter and Ethan Allen Express trains. Intercity bus operators include Vermont Translines, Greyhound Lines, and Megabus. A number of public transit agencies operate bus service at the local, county, and regional levels. Burlington International Airport is the state's primary airport. Road In 2012, there were 605,000 motor vehicles registered, nearly one car for every person in the state. This is similar to average car ownership nationwide. In 2012, about half the carbon emissions in the state resulted from vehicles. In 2010, Vermont owned of highway. This was the third smallest quantity among the 50 states. 2.5% of the highways were listed as "congested," the fifth lowest in the country. The highway fatality rate was one per , tenth lowest in the nation. The highways cost to maintain, the 17th highest in the states. 34.4% of its 2,691 bridges were rated deficient or obsolete, the eighth worst in the nation. A 2005–06 study ranked Vermont 37th out of the states for "cost-effective road maintenance", a decline of thirteen places since 2004–05. In 2007, Vermont was ranked the third safest state for highway fatalities. One third of these fatal crashes involved a drunken driver. On average, 20–25 people die each year from drunk driving incidents, and 70–80 people are in fatal car crashes in the state. Collisions with moose constitute a traffic threat, particularly in northern Vermont, and cause several deaths per year. In 2009, 93% of Vermont motorists were insured, tying the state with Pennsylvania for the highest percentage. In 2008, Vermont was the fifth best state for fewest uninsured motorists—6%. Trucks weighing less than can use Vermont's interstate highways. The limit for state roads is . This means that vehicles too heavy for the interstates can legally use only secondary roads. In 1968, Vermont outlawed the use of billboards for advertisement along its roads. It is one of four states in the