NAFTA Article 302:3:states that:
"On the request of any Party, the Parties shall consult to consider accelerating the elimination of customs duties set out in their Schedules. An agreement between two or more Parties to accelerate the elimination of a customs duty on a good shall supersede any duty rate or staging category determined pursuant to their Schedules for such good when approved by each such Party in accordance with its applicable legal procedures."
There have been three rounds of tariff acceleration between Canada. The second and third rounds were implemented in 2001 and 2002.; There have been four rounds of tariff acceleration between the United States and Mexico: these were implemented in 1997, 1998, 2000 and 2002.