No chains, and to my knowledge - not 4WD. Bus stopped at the end of my driveway on a hill, only 6 minutes late, and got started without even a hint of a wheel spin. I was impressed. Haven't seen any social media reported accidents involving busses, but just because it turned out fine doesn't mean it was a good idea. Roads were **** well past the time a 2 hour delay would have put busses on the roads. Friday looks like a slam dunk snow day, and even if it's not, we're going skiing anyway lol.