The device limits the power output of the motor and hence slows both the acceleration and the overall top speeds obtainable on the tracks where the cars are so equipped. These restrictions are supposedly in the interest of driver and fan safety, although many members of both of these groups feel that the close packing of cars and their inability to achieve separation may actually make the racing at these tracks more dangerous, as there are often massive and frightening multi-car pileups during races (especially at Talladega). Such crashes are dubbed "the big one" by drivers and fans and usually happen once per race. On rare occasions there are multiple such incidents, or on even rarer occasions, none. It certainly makes for a different style of racing at these events than that which occurs