The majority of this decline is attributed to cleaner fuel and vehicles. The Tier 3 Vehicle Emission and Fuel Standards Program, which sets new vehicle emissions standards in 2017, lowering the sulfur content of gasoline, will have a particularly notable impact. In addition, the Unified Plan provides for an integrated transportation system that incorporates all modes of travel. This includes not only roads and highways but also public transit, trails, bike lanes and other facilities. Providing choices for how people get around means fewer vehicles on the road. This translates into huge benefits. For example, transit riders along the Wasatch Front currently take 120,000 car trips off the roads each day, saving 850,000 vehicle miles traveled on the roads and 2,000 tons of emissions out of the air.