2023 Rule set. **Supplemental NASA MidAmerica rules. TREC Endurance: Intermediate Driver Experience is required-HPDE 3 or equivalent to be eligible to participate in this TREC event. All crew members, refueler and fire extinguisher handler over the wall during fueling are required to be in full safety gear to include full face helmet with visor. The refueler and fire bottle man must be in a 3.2/A-5, SFI 3.3 or better rated shoes/gloves/balaclava/socks. The fuel port shall not be opened until the engine is off. Work on the car and driver changes completed while engine is off. Region may have fire suits available to rent for crew members.