Flames have engulfed a truck, sending a huge tower of thick smoke billowing into the air this morning, and grinding traffic in Perth’s east to a halt. Fire crews rushed to the intersection of Great Eastern and Great Southern highways in Mundaring around 1am this morning, to reports of a truck towing two semi trailers alight on the road. The truck fire in Mundaring. 9 News PerthPolice say the blaze started on one of the trailer brakes, with the driver pulling over and getting out uninjured. The truck was carrying metal cylinders.