The CART-IRL Split coincided with an enormous expansion of stock car racing, governed by NASCAR, from its past as a mostly regional circuit mainly followed in the Southern United States to a truly national sport. NASCAR's audience peaked in the early 2000s, and has declined quite a bit ever since the implementation of the Chase for the Cup in 2004, though it continues to have around 2–4 million viewers per race. Among NASCAR's popular former drivers are Jeff Gordon, Dale Earnhardt, Matt Kenseth, Tony Stewart, Dale Earnhardt Jr., and Richard Petty. Among NASCAR's popular active drivers are Jimmie Johnson, Alex Bowman, Kurt Busch, Kyle Busch, Chase Elliott, Ryan Blaney, and Kyle Larson. NASCAR's most popular race is the Daytona 500, the opening race of the season, held each year at Daytona Beach, Florida in February.