Union Boulevard at the intersection of Austin Bluffs Parkway will be closed at 8 p.m. today through 6 a.m. Friday to allow construction crews to work on the interchange bridge.Drivers can expect detours and delays and are urged to find alternate routes.Northbound Union traffic will be detoured eastbound on Austin Blufis to Academy Boulevard. Southbound Union traffic will be detoured to westbound Austin Bluffs to Nevada Avenue.East- and westbound Austin Bluffs will be reduced to one lane in each direction.A map of alternate routes is available here.Crews began constructing the interchange that takes Austin Bluffs over Union in January 2007. The project is scheduled to be completed in November.

Republican presidential candidate Sen. John McCain, R-Ariz., greets Bristol Palin, daughter of vice presidential candidate Alaska Gov. Sarah Palin and her boyfriend Levi Johnston upon his arrival in Minneapolis, Wednesday, Sept. 3, 2008. Photo by THE ASSOCIATED PRESS