Lahore - Over a dozen people were injured when 12 vehicles collided with each other after a trailer driver applied emergency brakes on Kala Shah Kaku Interchange yesterday. The incident occurred when driver of a trailer applied breaks all of a sudden near Kala Shah Kaku interchange which led to a severe collision between 12 vehicles coming in a row behind each other. The incident led to traffic jam and hundreds of vehicles were stranded on Kala Shah Kaku Interchange. Rescuers shifted the injured to hospital for treatment. Police registered a case against trailer driver and further investigation was in process.