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Helmet-to-helmet collisions are occurrences in American football when two players' helmets make head-to-head contact with a high degree of force. Despite its long association with the sport, this type of contact is now considered to be dangerous play by league authorities due to the potential of causing serious injury. Major football leagues, such as the NFL and NCAA, have taken a tougher stance on helmet-to-helmet collisions after the US Congress launched an investigation into the effects repeated concussions have on football players. Other possible injuries include head traumas, spinal cord injuries, and even death; nevertheless helmet manufacturers are constantly improving their designs in order to best protect their users against injuries from such collisions. Intentionally causing a helmet-to-helmet collision is banned in most, if not all, football leagues. The crack down on helmet-to-helmet collisions has resulted in reappraisals of the sport. An image of two helmets smashing together—which had been a staple for 20 years—was dropped in 2006 from ''Monday Night Football'' on ESPN. The NFL also ordered Toyota Motor Company to stop using similar helmet collision in its advertisements.〔 However, despite the safety concerns, some professional football players have criticized bans on helmet-to-helmet collisions on the basis that gridiron football is a game that is supposed to be composed of the world's biggest and best athletes, and placing such restrictions "waters down" the game. ==Rules by league== * Helmet-to-helmet hits are banned in the NFL, with a penalty of 15 yards for violations. In 2010, the NFL placed its policies pertaining to these incidents under review, considering heavy fines and suspensions. In addition to prohibiting these hits during actual play, the NFL does not allow the sale of these hits on its site in hopes of reducing them. * The Canadian Football League prohibits the use of the helmet to butt, ram, or spear an opponent. Players are penalized for what is not deemed to be an 'acceptable' football play. * In the NCAA, helmet-to-helmet collisions have been banned for years, but they were illegal only when intentional. In 2005, the NCAA took the word "intentional" out of the rules in hopes of reducing these incidents even further. Beginning with the 2013 season, players who are flagged for such hits are automatically ejected from the game in addition to a 15-yard penalty, under the new "targeting" rule. If the ejection occurred in the second half, the player must also sit out the first half of his team's next scheduled game. This rule was revised in 2014 to overturn the yardage penalty in addition to the ejection if the player's hit is not flagrant. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Helmet-to-helmet collision」の詳細全文を読む スポンサード リンク
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