The 2006 NCAA Division I FBS football season was the highest level of college football competition in the United States organized by the National Collegiate Athletic Association (NCAA). The regular season began on August 31, 2006 and ended on December 2, 2006. The postseason concluded on January 8, 2007 with the BCS National Championship Game in Glendale, Arizona, where the No. 2 Florida Gators defeated the No. 1 Ohio State Buckeyes by a score of 41–14 to win the national title. The Boise State Broncos were the year's only undefeated team in both levels of Division I football after defeating Oklahoma in the Fiesta Bowl. Rules changes The NCAA instituted the following rule changes for the 2006 season. The NCAA ruled that teams could schedule twelve regular-season games (up from eleven) beginning in the 2006 season. (NCAA teams in Alaska and Hawaii, and their home opponents, are allowed to schedule an extra game over and above this limit.) Instant replay is now officially sanctioned and standardized. All plays are reviewed by the replay officials as the play occurs. They may call down to the on-field officials to stop play if they need extra time to make a review. Each coach may also make one challenge per game. In the case of a coach's challenge, the coach must have at least one time-out remaining. If the challenge is upheld the coach gets the time-out back but the challenge is spent. If the challenge is rejected, both the challenge and the time-out are spent. Players may only wear clear eyeshields. Previously, both tinted and orange were also allowed. The kicking tee has been lowered from two inches tall to only one inch. Halftime lasts twenty minutes. Previously, it was only fifteen minutes, except for special ceremonies (i.e. homecoming). On a kickoff, the game clock starts when the ball is kicked rather than when the receiving team touches it. This rule change has resulted in controversy, highlighted by the matchup between Wisconsin and Penn State on November 4, 2006, in which Wisconsin deliberately went off-sides on two consecutive kickoffs to run extra time off the clock at the close of the first half. On a change of possession, the clock starts when the referee marks the ball ready for play, instead of on the snap. This was the rule in the National Football League prior to 1973, and in high school football prior