[Tanjay]

Anyone any good ideas, Buddy is nearly three and a really good dog, except for his chasing of traffic. I always have him on a lead, except when we go to the local park, which I have just started going to, the odd car does travel through the park at 10mph, tonight he totally ignored my shouting and headed straight for the car barking like mad, but he also had another dog in toe who was playing with him, this other dog didnt realise what he was doing, but he did stay back from the car, then he headed back to me as though nothing had happened, when he is on the lead, I pull him close and say no, but off lead he is oblivious to my voice, does anyone have a suggestion?