Two westbound express lanes on Hwy. 401 in North York are closed after a dump truck carrying gravel caught fire earlier this afternoon. The Ontario Provincial Police announced the closure at around 2:30 p.m. They say that the two express lanes are closed at Allen Road. According to OPP Sgt. Kerry Schmidt, the fire started after the vehicle’s brake lines sheared, causing the parking brakes to engage while the truck was still moving which generated enough heat to ignite the trailer. No injuries were reported as a result. Police say cleanup efforts are underway. One left express lane and all collector lanes remain open.