well, turning now to houston, texas where a collision on the side of the highway could have triggered tragedy. if it were not for a quick thinking team of 911 dispatchers. the driver who caused it swerving in and out of lines on the phone heading right for a family pulled over on the shoulder. abc s kendis gibson with this story. reporter: watch and listen as a potential tragedy develops on a houston highway. oh [ expletive ]. oh, my god. two kids. call 911. vehicle traveling eastbound. reporter: emergency operator alexa got the call early sunday morning. a driver swerving in and out of lanes heading right toward a family of seven with a broken down vehicle in the shoulder. dispatchers spot the driver on one of the dozens of traffic cameras that dot the highway. with that car getting closer and closer, another dispatcher springs into action, radioing the tow truck operator who has been out helping the family. be advised sir, it s a vehicle approaching you that is swerving