If anyone was wondering what shut down all the northbound lanes on 75 yesterday afternoon for hours - All northbound lanes of US 75 were shutdown at the Campbell Road exit as crews work to clean up debris from a car crash, according to Richardson police. 

Police said the accident involved several vehicles and led to debris being scattered across the roadway. An 18 wheeler was traveling southbound carrying 44,000 pounds worth of pallets of granite and hit the center median. The load broke and granite fell into the northbound lames of traffic, police said.