BOSTON -- Six people suffered injuries after plunging off a cliff in an ATV accident in South Hadley over the weekend. Fire officials say it's amazing they survived.

As NewsCenter 5's Heather Unruh reported Wednesday, a local family says this accident is just more evidence that ATVs are dangerous for adults, and kids.

They are fast and fun. Kids don't need a license to drive them, so many parents think they're safe. But they are not.

"In October of 2006, my son went to play at a friend's house, and the parents let him drive on an ATV quad," said Katie Kearney, of Plymouth, Mass. "He suffered a brain injury that resulted in his death five days later."

Ever since Sean Kearney's death, his parents have been pushing Massachusetts lawmakers to raise the age limit for ATV riders.

"We've been lobbying for a bill to keep children off of these machines," she said.

Currently, children 10 and older are allowed to ride when they have adult supervision. Under the proposed new bill the age goes up.

"No child under 14 would be allowed on any of them," Kearney said.

"We know there is a substantial risk of injury and death to children who ride ATVs," said Dr. Lois Lee, director of the Emergency Department Injury Prevention Program at Children's Hospital Boston.

Lee is a big supporter of the bill.

"We know that children do not have the cognitive or physical ability to be able to maneuver these very heavy and powerful machines," she said.

According to Lee, tens of thousands kids are treated at emergency rooms with ATV injuries. The most recent numbers in Massachusetts show that between 2004 to 2005, 900 children were hurt on ATVs.

"About a quarter of those children required intensive care unit level of care. Thirty-five of those children had significant traumatic brain injuries," Lee said.

That's the same injury that led to Sean's death -- a death his parents believe could have been prevented if more people understood ATVs are not toys.

"It just amazes me that people don't put children's safety first," Kearney said. "If adults can't control them not to flip, how can they expect a child to?"