High Groove

High Groove is a racing line that runs closer to the outside wall of a racetrack, as opposed to the inside or bottom portion of the track.

Think of a racetrack like a multi-lane highway that curves in a circle. Just as you might choose different lanes depending on traffic conditions, race car drivers can choose different paths around the track. The High Groove represents the "outer lanes" of this racing highway.

Drivers don't just pick one groove and stick with it for the entire race. They constantly search for the fastest route around the track, and this can change throughout an event. Track conditions play a huge role in determining which groove works best at any given moment.

In dirt track racing, the High Groove often becomes faster as the race progresses. This happens because the bottom of the track can become too dry and slippery, while the higher line maintains better grip. It's like choosing between a slick sidewalk and one with better traction.

NASCAR drivers also use the High Groove strategically on oval tracks. Sometimes the outside line provides better grip, especially when track temperatures change or rubber builds up in certain areas. Weather conditions like heat can make the lower groove less effective.

The choice between high and low grooves isn't just about speed—it's also about positioning during races. A driver might move to the High Groove to find cleaner air, avoid traffic, or set up a passing opportunity. Car setup also influences which groove works best for each individual driver.

Understanding groove selection helps explain why you'll see cars spread across different parts of the track during a race, rather than all following the exact same path like a train.