HOUSTON (KTRK) -- An 18-wheeler heading north on Highway 59 in Houston Friday jackknifed across four lanes of traffic, barely missing cars around it, a dashcam video shows.That video, sent to ABC13, shows traffic slowing then an 18-wheeler swerving to miss hitting the slowed traffic.As that big rig swerved to the left, miraculously, the congested lanes were empty, leaving space for the truck. The truck then crunched in on itself and rolled backward, again into lanes that were once filled with cars. The video shows cars being able to move around the truck, undamaged.There were no reports of injuries.ABC13 received the video anonymously and could not immediately verify the timestamp or location of the video.