Grand Junctionâs busiest intersection is about to get a lot busier. In a couple of weeks, construction crews will start tearing up the somewhat convoluted intersection where Grand Avenue, First Street and Interstate 70B meet, and realign it into something that the Colorado Department of Transportation believes is more drivable. That work, the fifth phase in a series of improvement projects on the business loop from Mesa Mall to Fifth Street, is going to take some time. âWe have two primary facilities, two major highway systems that are interacting with each other, and itâs the main thoroughfare for all the Redlands residents,â said Kaity Clark, Grand Junction regional engineer for CDOT, referring to the confluence of U.S. 50 and Colorado Highway 340.