It's a dangerous place for a dumped dog, but people drive there every day and leave their pets behind; residents often see the dogs chasing the car as it drives away. (shelterme.tv)
One of the most serious, and unfortunately most common, problem behaviors among dogs is that of chasing cars. (dogbreedz.com)
From your description it sounds like your dog really wants to chase cars as they pass by him. (dogtrainingbasics.com)