Two women are fighting for their lives in a Toronto hospital following a serious collision on Highway 401 early Wednesday morning.Ontario Provincial Police said the crash involved a transport truck and a passenger vehicle in a social media post shared just after 5 a.m.Paramedics transported two women to a hospital with serious, life-threatening injuries.The westbound ramp from Highway 401 to Highway 427 remains fully closed for an investigation. Motorists are advised to use alternate routes.