When construction on the latest Interstate 15 project begins in early 2010, most of the interstate near Las Vegas will have been under construction within the past year. “We will have I-15 pretty much messed up all the way from Craig Road down almost to the state line,” Nevada Department of Transportation Director Susan Martinovich said Thursday at a kickoff for the latest project. Interstate 15, the most highly traveled corridor in the state, has had major construction projects underway since September 2008.