Three vehicles collided at Mt. Pleasant Rd. and Merton St. Thursday injuring at least one driver and snarling traffic in the neighborhood. It was widely believed at the scene that a southbound car and a car heading east on Merton hit each other. It seems somebody misjudged or ignored traffic lights. The southbound car, a Ford, then struck a northbound pickup truck and flipped onto its side. Witnesses said the driver of the car on Merton was being treated in the ambulance seen in photos above. The driver of the flipped car, once out, walked into the residential building on the southwest corner and rested courtesy of someone there. Traffic was diverted on Mt. Pleasant at Belsize and St. Clair. The knock-on effect of this, as it always is, was very heavy traffic on Welland, Moore and Bayview Aves. as drivers looked for another route.