I got couple of stupid friends and every once in a while when they are on highways they tend to start racing. They don't have anything special. Accord, hyundai (elentra i think), etc but they go upto 160-180km/h zig zagging like crazy. Most of them are not good drivers IMO.

Talkin them down or whatever doesn't help much. Even if I don't participate they will keep going. At this one time I wasn't participating and then I saw some of their "stunts" and I had to speed to almost 200km and get ahead of them and block them (with help of another car who is going normal speed) because I got this feeling something is gonna happen v.terrible if this continues. After that they were telling me I am such a pussy. WTF.

Any suggestions how to make 'em understand how dangerous and stupid this is?