A dump truck rolled over on I-55 in the west suburbs of Chicago on Friday, leaving northbound lanes blocked by gravel and rocks and prompting traffic delays, state police warned. Around 12:42 p.m., a dump truck rolled over and spilled a load of gravel and concrete works across all northbound lanes of I-55 at County Line Road in Burr Ridge, Illinois State Police saidStream NBC 5 for free, 24/7, wherever you are. WATCH HERE WATCH HEREAn IDOT traffic camera on I-55 showed a glimpse of the scene around 1:30 p.m."Heavy debris and lane blockage is being reported. Delays of up to two hours were possible as traffic backed up while crews worked, according to Total Traffic and IDOT cameras. A camera on I-55 near Lemont Road showed drivers were stuck sitting on the highway roughly 6 miles from where the truck overturned around 2:50 p.m.