Two men are in a critical condition after several crashes involving about 30 vehicles caused traffic chaos north west of Melbourne. The multi-vehicle collision on the Western Freeway at Myrniong near Bacchus Marsh happened just before 4pm on Monday. Victorian Police said 14 vehicles were involved in one crash that happened with heavy fog in the area while five other separate collisions took place in the surrounding area. Ambulance Victoria confirmed paramedics responded to "several multi-vehicle incidents" at Myrniong with a total of 20 patients taken to hospital. Police said two men were hospitalised in a critical condition, each involved in separate collisions. Other people from various collisions were treated for non-life-threatening injuries. Police said the cause of the collisions appeared to be heavy fog in the area and drivers not driving to the conditions. Australian Associated Press