A Malibu, California, resident has voiced concern over illegal skateboarding after witnessing three downhill skateboarders racing down Encinal Canyon Road, a steep and narrow road between Agoura and Malibu, the Agoura Hills Patch reported Wednesday.

“These skateboarders could have been killed by an impatient driver, or hit a rock and been badly injured,” Sonia Ottusch told Patch.

As it turned out, the skateboarders were Ross Druckrey, Ethan Cochard, and Arian Chamasmany, and they were filming a video that essentially serves as a commercial for G-Form, a company that makes elbow and knee padding. The company didn’t return calls from Patch. The video was posted on Jan. 25. Watch:

Had a car been rounding the corner from the other direction, the skateboarder that fell into the opposite lane very well could have been killed.

Det. David Huelsen of the Los Hills/Malibu Sheriff’s Station told Patch he is aware of the video and illegal skateboarding, and even witnessed the illegal skateboarding firsthand, though he doesn’t mention issuing any citations.

“They were going so fast,” he told Patch. “I couldn’t believe it.”

The sheriff’s department and California Highway Patrol respond to calls of illegal skateboarding on canyon roads, and a serious crackdown began last year after Christopher Schwartz, 29, died when he crashed into a parked car while skateboarding a steep street in Agoura.

Motorists are instructed to call 911 when they observe illegal skateboarding.

“We just tell the callers to be really careful going around them,” Huelsen said. “If you hit them, it might be your fault. You want to be really careful, get away from them. Keep your distance. Call us and if you can get away from them safely. Don’t take any action on your own.”