Tomorrow is the across-Quebec deadline to put winter tires onto your car. Unless you’re driving an STM bus, because the winter tire deadline apparently doesn’t apply.\nSTM buses never actually use winter tires. Rather than slap on winter tires, the STM goes through a yearly “retreading” process in November, where standard tires are modified to increase traction.\nREAD ALSO: Video Showing Crashed STM Buses Being Abandoned In Montreal\nNew tires are placed on the front of the bus and retreaded tires are put on the rear, “a homemade recipe” that is apparently quite effective, a spokesperson for the STM said to CTV News.\nAccording to the STM, buses don’t need to have winter tires because “certified winter tires” aren’t available.\nBut after seeing what happened this past week, when multiple buses slipped and slid on Montreal roads, blocking up traffic, one could call the STM’s winter tire operation into question.\nOne articulated bus (the one’s that look like an accordion) got completely stuck along Cote des Neiges.\n#STM bus 165 jackknives on Côte-des-Neiges Blvd. Driver tells Global News street wasn’t salted. #polmtl pic.twitter.com/gKISMcGpWg\n— Tim Sargeant (@tfsargeant) December 12, 2017\nThat was “a normal day for the STM,” however. The massive traffic problem caused by the jackknifed bus was attributed to the busy nature of Cote-des-Neiges, as the accident caused a butterfly effect of traffic woes.\nThe amount of traffic incidents following the latest snow storm (of which there were 12) are described as completely "normal" by the STM.