A tri-oval is a shape which derives its name from the two other shapes it most resembles, a triangle and an oval. Rather than meeting at sharp, definable angles as the sides of a triangle do, in a tri-oval these angles are instead rounded into smooth curves. While an oval has four turns, a tri-oval has an "extra" fifth turn.
Use in racetracks
This term is most often used to describe the shape of many automobile racetracks, including: Calder Park Thunderdome, Daytona International Speedway, Kansas Speedway, Kentucky Speedway, Nazareth Speedway, Pikes Peak International Raceway, Pocono Raceway, Sanair Super Speedway, Talladega Superspeedway, and Walt Disney World Speedway.
The use of the tri-oval shape for automobile racing was conceived by Bill France, Sr. during the planning for Daytona. The triangular layout allowed fans in the grandstands an angular perspective of the cars coming towards and moving away from their vantage point. Traditional ovals (such as Indianapolis) offered only limited linear views of the course, and required fans to look back and forth much like a tennis match. The tri-oval shape prevents fans from having to "lean" to see oncoming cars, and creates more forward sight lines.
In other racing vernacular, the term "tri-oval" is also used to specifically describe the part of the track which represents the top triangular point of the course, which is used as the main stretch, the pit straight and usually the start–finish line. It is recognizable in most tracks by a manicured grass area.
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