This terrible accident happened when the Proton Wira involved switched lanes (presumably out of the sudden) and tried to cut into the queue of vehicles at the toll booth.
With more and more toll plazas switching to increase the amount of electronic payment lanes and reducing cash lanes, motorists should take note of what payment method they want to use and be sure they are in the lane that they want to use well before the queues start to prevent such incidences from happening.
If you do happen to have to switch lanes into the middle of one that already has a long queue, do not do so suddenly. Turn on your indicators and wait until someone who is completely aware of the manoeuvre that you want to do allows you to cut in.
