Nevada: Construction of new express lanes for I-15 in Las Vegas is scheduled to begin before the end of 2008, according to the Nevada Department of Transportation. The department has initiated an I-15 Resort Corridor Study to figure out how to deal with the increased urban traffic that this is expected to cause.

Utah: The US Department of Transportation has accepted the environmental review and given the green light for the design, right-of-way acquisition and construction of a freeway widening and renovation project for I-15. The original proposal was for the widening of 43 miles between Sandy (near Salt Lake City) and Payson, but the state can’t afford the $6-7 billion price tag. So instead, two lanes will be added in each direction between American Fork and Spanish Fork, and a number of bridges and interchanges will be reconfigured or rebuilt. This will cost $2.6 billion. Construction is expected to begin in Spring 2010.