Interstate 70 runs east–west from Utah to Maryland. It is also the primary corridor on which Denverites access the mountains. A proposed $1.2 billion widening of an urban portion through a primarily low-income and Latino community has been met with community protests and calls to reroute the interstate along the less urban Interstate 270 alignment. They cite increased pollution and the negative effects of tripling the interstates large footprint through the neighborhood as primary objections. The affected neighborhood bisected by the Interstate was also designated the most polluted neighborhood in the country and is home to a Superfund site.
State Highway 470 (C-470, SH 470) is the southwestern portion of the Denver metro area's beltway. Originally planned as Interstate 470 in the 1960s, the beltway project was attacked on environmental impact grounds and the interstate beltway was never built. The portion of "Interstate 470" built as a state highway is the present-day SH 470, which is a freeway for its entire length.