sentences:  On May 1, 2008 I-75 northbound traffic was re-routed back along its original path in downtown Knoxville along Interstate 275 as part of SmartFix 40, a major construction project that includes closing a portion of I-40.Traffic was re-routed along I-275 as the ramp from I-640 eastbound/I-75 northbound to I-75 northbound is only one lane which causes traffic delays at peak times.In December 2018 a contract was awarded to rebuild the interchange with I-24 in Chattanooga.