I was driving down Mcdougall just past Tecumseh street (near Kennedy high School). Everyone whose driven in that area knows it's a 40 KM/ H driving zone. Well, I was going on speed limit but the guy behind me was REALLY tailgating me and just seeing from his expression on his face he was irritated with me. I drove to the side and let him pass me and he away he went! As I drove on I sped up just a bit more from my anger, and the car coming against my traffic flashed his lights about 4 times quickly before we passed eachother . Somehow I KNEW that was a warning to slow down. Well thank God for that!! Because as I reached close to the railway track there was a lovely undercover cop, who luckily CAUGHT the impatient driver who was behind me and would have caught me aswell if it wasn't for that other car that warned me. If you're reading this , I truly thank you!! .