Today's experience towards Parnassus.. As soon as I put them on at 50 meters, they started breaking one by one and getting stuck inside the rim. One broke as I was tightening it, the other 5 out of 10 just left on their own, they snapped, and all this happened with just 1st gear and rolling without even going 100 meters. For traffic control, they are fine in the trunk, but for regular use, never!

Bought only for the winter since the law says you must have them on your car in August. They are 5 stars because they are perfect for throwing wherever you want and they don't take up space. Plus, you save on weight. Since they're fooling us, let's have some fun. They don't work well in general. They are only for very snowy roads, not for icy ones