Image 1 of 6 ▼The Brief All southbound lanes of the Dallas North Tollway near I-635 are shut down, and drivers are advised to avoid the area during the rush hour. All southbound lanes of the Dallas North Tollway are currently shut down near the Galleria in Dallas because of a large piece of equipment that fell off a tractor-trailer. Images from SKY 4 showed a large piece of equipment on the roadway and damage to the underside of an overpass. Big picture view:The North Texas Tollway Authority confirmed that all southbound lanes of the tollway are currently shut down. Drivers are encouraged to avoid the area or expect heavy traffic and delays for the remainder of the rush hour.