Tuesday Test & Tunes are open to all race cars with competition-licensed drivers. Once the Lime Rock Park race-control officials know which cars are coming, the officials divide the cars into groups of similar configurations and speeds. The goal is to give every team and driver as much track time as possible.

Gates open at 8:00 for Test & Tune Tuesdays, with cars on course beginning somewhere between 12:00 - 12:45 and ending between 5:00 and 6:00 p.m.
 
Only race cars that meet the current safety regulations of the sanctioning body under which it competes or tests are admitted, and drivers must present proof of a current racing competition license (such as but not limited to SCCA, IMSA, VSCCA, SVRA, Vintage National License, RCCA, Pro-Rally, NASCAR, IndyCar, FIA, EMRA, CASC). Recent graduates (past 12 months) of an accredited three day (or more) racing school are also given eligibility consideration.