Wow. So that's how reckless drivers think (Flint).
If you don't keep up, you get run off the road? No, you don't. If other idiots want to drive too fast for conditions, you stay to the right and they move around you.
All that spinning out must have done a number on your insurance premiums. 
In fairness I can attest to the dickish driving that Flint is describing in Detroit having been born and raised there. The City is largely devoid of life and employment with freeways built for triple the current population. Enforcement is largely non-existent and you do have to drive fast to keep up with the lightning quick pace. That said, if conditions were bad enough to have a large degree of sliding then there plenty of solid surface alternatives like Woodward, Grand River, Telegraph, and even Michigan to get you out of the city. Either way, doesn’t pay to have short tread in snow or even copious amounts of rain.
Michigan in the Lower Peninsula gets for the most part mild winters. The driving populace on the whole is way too confident in their abilities which often has disastrous results. I-96 between Detroit and Lansing was infamous for people skidding off into the snow in the median or shoulders...Grand River was so useful as an alternate. That said, the state trunkline system gets cleared reasonably quick. The same can’t be said for local level roadways. I recall driving to school and work often with 2 inches plus on the road...good luck getting someone to call a weather delay.
Speaking of tires, does anyone ever switch to snow tires? I used to have a set that was essentially for snowy conditions that I would put on my car during winter trips on the Mogollon Rim or even just the Colorado Plateau. Back in 2013 I went through all five National Parks in Utah plus Great Basin after a large snow storm. The only park that gave me trouble was Arches where the snow was bad enough that I opted to turn around rather than put chains on. The Island in the Sky Road in Canyonlands had snow the entire road but having the right tires made it passable with a reasonable pace which was well below the posted 35 MPH speed limit.
But that said, tread depth or lack there of in my personal experience tends to be virtually non-existent on any tire once you get below 5mm.