Almost every driver knows that in the winter, you should have winter tires on your car. But countless folks don't bother anyway. Either they don't know that you should, they don't want to buy another set of tires, or they don't want to go through the manual effort of changing them.

Well, that's bad. But how bad is it? BMW recently released a new video, showing how three of the same vehicle performed in the various tires and in various seasons.

The tests used 3 BMW M4 Coupes. Two of them were equipped with summer and winter tires accordingly. The third car has special performance tires to show what "the best" looks like. In the summer, the special tire was a semi-slick tire. In the winter, it was studded tires.

In the summer tests, the summer tires considerably outperformed the winter ones, with the semi-slick doing a bit better than that. The flatter, smoother treads and firmer sidewalls of the tires ensured that the vehicle maintained traction on the road, resulting in better swerve control, acceleration, and breaking.

They then performed the same tests in the winter. This time, the winter tires performed considerably better than the summer set. The larger, deeper treads allowed it to maintain control on the snow-covered road.

The video shows us what we already knew: using the correct tires for the season makes a considerable impact on your ability to control the vehicle.

Now if the planet would stop having such wild weather, it'd be easier to know which tires to use.