Tri-Oval

A Tri-Oval is a racetrack design that combines elements of a triangle and an oval, featuring three distinct sides with rounded curves instead of sharp angles, commonly used in NASCAR and other oval racing series.

Pioneered by Bill France Sr. at Daytona International Speedway, the tri-oval layout significantly improves spectator viewing angles. The design includes a slight curve along the main straightaway (sometimes called the "tri-oval section"), allowing fans to see cars approaching and moving away rather than just passing by in a straight line.

Famous tri-oval tracks include Daytona International Speedway, Talladega Superspeedway, and Las Vegas Motor Speedway. A variation called a "quad-oval" features a double dogleg on the front stretch instead of a single tri-oval curve, as seen at Charlotte Motor Speedway.