Multan- A lady police constable was killed in collision between tractor trolley and motorcycle today. Police said that the accident took place in 19-Kasi area of Multan where an over speeding tractor trolley knocked down a motorcycle killing lady police constable on the spot. The driver responsible for the accident managed to escape from the scene.  Police took the tractor trolley into possession and registering a case against the fleeing driver started raids to arrest him.