I saw a random ad pop up for "Disposable Traffic Cones!" and thought it was an interesting concept. I don't think they're going to replace rubber cones for stuff, but they sure look less damaging to hit and might have a niche somewhere. The ones in the link below are 28" tall, $3 a cone, and made of of paper. You weight them by putting sand or gravel in the pocket.



http://www.safetycones.net/

 

Autocross??