speed limit and no hanging on to moving cars. kyle chin, an experienced rider who prefers to call it downhilling, showed us the pads he uses and told us that most riders carefully choose where and when they ride. you make comparison with skiing. there is no traffic on a ski slope. no cars coming at you. a big issue with downhill skateboarding in particular when you compare it to skiing or other styles of skateboarding we don t have environments that are built for our use. reporter: he says the new law won t change anything. bottom line, the law is not going to stop you? probably not. it s my passion. it s something that i love. we re going to keep on doing it. reporter: neal karlinsky, abc news, santa monica, california. 40 miles an hour? brave, crazy, both? i can t make sense of it. many of them didn t have helmets. no pads. and do you need a law to tell a young person, okay you can only go 10 miles per hour? don t hang on to cars? it s unbelievable.