During the week Two Thousand City broke out the Anti Snow Measures. The measures come in the form of yellow containers next to the road. Inside the containers you will find bags of course sand, possibly mixed with salt.
When there is snow on the road, someone, and I do mean someone, because I haven't actually seen someone doing it but only the end results, will take the sand and throw it on the road. This has the effect of melting the snow and even before then it will add traction in the snow itself.