A dangerous fad that has young people skateboarding on freeways including Interstate 5 in San Diego is catching on in Southern California and it’s also catching the attention of law enforcement.

Check out this video that was posted online two days ago that shows a man skating on south I-5 in Carlsbad just north of the La Costa Avenue offramp (and harkens back to a CHiPS episode, below). The rider’s Instagram page says he’s from Oceanside.

Freeway skateboarding

But that’s not the only video that has popped up in recent days.

Several more posted on the social media site with the hashtag #freewaychallenge show the daredevils exiting cars onto highways and riding in lanes in between cars and trucks slowed in traffic. The clips show riders cruising up and down shoulders and center divides, jumping concrete barriers, taking air and doing twirls and twists. One man holds onto the back of a grocery store big rig truck for the risky ride.

In one, a young man is seen cruising down an incline onto what looks like a part of Coast Highway somewhere where he promptly falls onto his back on the roadway Luckily, no cars were coming.

Take a look.

The California Highway Patrol has taken notice of the new trend and is warning skateboarders that freeways are not the places for non-motorized rides on two wheels.

CHP Officer Jose Nunez told the Los Angeles Times that riders could face charges if caught.

"We are aware of skateboarding on the freeways in downtown and parts of L.A. There has been social media and there have been hashtags appearing with a challenge to skateboarders," said Nunez. "These are not safe places and weren't designed for that kind of thing.... This is an enforceable action and if we can identify any one or vehicle, action will be taken against those individuals."

Drivers having to dodge skateboarders riding on roadways is nothing new. Check out this clip from an October 1978 episode of the television show CHiPs, which dramatized the issue in only the way that a program made almost 38 years ago could do.

"Neighborhood watch"

Sandy Coronilla contributed to this report.