New York officials are performing emergency road work on Interstate 84 westbound just before exit 21. The construction started yesterday afternoon before 3pm.  That caused back ups on the highway during the evening rush hour that stretched back to exit 4 in Connecticut.  The right lane is closed for an undetermined amount of time.  This is the same area where crews are constructing a new overpass.  Drivers are being encouraged to use Mill Plain Road/Route 6 as alternate to the highway.  Motorists are being warned however that many drivers are using side roads to get around the highway jam.  The delays started to build again back to the same area by early this morning.