Comcast employees are required to obey traffic laws while operating company vehicles. All Comcast vehicles are individually numbered for identification. They also have a "How's My Driving?" sticker on the rear with a 1-800 phone number to call. W/O the ID #, there isn't much anyone can do.
Hello, the best thing to do when anyone is driving unsafely is to call the police. Were you able to get the license number to this vehicle?