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- Understeer - A condition in which the rear tires have more traction than the
front tires. The front tires will slide across the track toward the outside
wall rather than turning into the corner. Also called push.
- Unlap - A driver down one lap passes the leader to regain
their position on the lead lap.
- USAC - United States Auto Club.
- USAC NM/AZ - United States Auto Club's New Mexico &
Arizona Regional Sprint Car Series.
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