If you're planning on commuting Thursday night, it looks like it's going to be messy. According to a recent announcement from Sgt. Kerry Schmidt, a 20 car pileup occurred in the northbound lanes just south of Barrie. The Highway 400 pileup has closed off the highway, so drivers are warned to take another route until further notice.\nUPDATE: Just before 4 p.m. on Thursday evening, the accident was cleared and lanes were reopened. EARLIER: The multi-vehicle collision took place at Highway 400 northbound at Innisfil Beach Rd. Traffic is being diverted off at Highway 89 due to all the lanes being currently blocked.The highway was shut down at 1:30 p.m. on Thursday afternoon. There has been no re-opening time announced as of yet.Traffic will no doubt be much slower going northbound on Highway 400 today. The northbound lanes on highway 88 at Bradford are also closed. There is still only limited information about what caused the collision or if there are any injuries. Officers are currently responding to the situation.With the larger amount of collisions in recent months due to poor weather, Sgt. Kerry Schmidt reminds drivers to pull over to a safe spot on the highway if they are able to before inspecting the car.The pileup looks as brutal as the weather in the most recent photo shared.\n#COLLISION : 400 n/b n/f Innisfil Beach rd #Innisfil Reported up to 20 Vehicles , Emergency Crews are on scene AVOID AREA HIGHWAY BLOCKED while Emergency crews are on scene #Traffic . pic.twitter.com/gZZ4vl5hkZ— Muskoka411 News (@Muskoka411) December 19, 2019\nWith snow coming down, roads are slippery and visibility is low. This is a result of the snow squall warning that was announced yesterday. The squalls were forecasted to be the worst on Wednesday morning and expected to clear up by Thursday morning.\nTRAFFIC ADVISORY : 400 n/b at Hwy 88 #Bradford All Lanes will be CLOSED due to the amount of Collisions , All routes off the Highway will be Slow to the Amount of Traffic , No Time on Re-Opening #Traffic pic.twitter.com/BBtf2TnMYp— Muskoka411 News (@Muskoka411) December 19, 2019\nIt is advised to not drive unless you absolutely have to today, and wait until the weather clears up. Otherwise, you may be in for a longer-than-normal commute and some dangerous driving conditions.\nWinter weather collisions in the #GTA - 20 car pile up and a motorist has been struck https://t.co/JapljlDHd5— Sgt Kerry Schmidt (@OPP_HSD) December 19, 2019\nEven though it is daylight, it is hard to see, so make sure your headlights are functioning properly before hitting the road.\nDrive safe out there.\nThere are stories everywhere. If you spot a newsworthy event in your city, send us a message, photo, or video @NarcityCanada on Twitter and Instagram.