Despite mounting casualties from crashes of recreational off-highway vehicles, the U.S. Consumer Product Safety Commission has shot down a proposal to track injuries and deaths involving the popular trail machines.

Commissioners voted 3-2 against adding the vehicles, known as ROVs, as a category to the agency’s annual report on all-terrain vehicle, or ATV, deaths and injuries. Commissioner Elliot Kaye, who proposed collecting data on ROV deaths, said sales of the vehicles quadrupled between 2000 and 2015, and that they are one of the deadliest products on the market.