Overturned 18-wheeler on I-35 in Dallas Causing Delays

A 18-wheeler involved in a rollover crash is causing delays for drivers heading southbound on Interstate 35 in Dallas.Interstate 35 lanes are closed at Clarendon Drive and traffic is forced to exit at Zang Boulevard, according to KXAS-TV (NBC5).The accident happened about 4 a.m. at I-35 and Zang Boulevard.The condition of the driver is unclear.