Despite years of enforcement efforts, authorities in one Colorado county say complaints about illegal street racing and street takeovers continue to rise.

"It's our number one complaint," Jefferson County Sheriff Reggie Marinelli said.

Marinelli said while the issue isn't new, the scale and frequency of the incidents have grown -- along with how they are promoted online.

"It's much different today because of the number of participants and the amount of advertising that goes on," she said.

Jefferson County Sheriff Reggie Marinelli talks to CBS News Colorado reporter Karen Morfitt about illegal street racing, meetups, and "takeover" events. CBS

Residents have voiced growing concerns, saying the activity is happening both day and night -- even outside of homes.

"I've heard from p

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