A penalty, usually assessed for speeding on pit road or for unsafe driving. If a penalty given, the car must be brought onto pit road and stopped for one full second in its pit stall.
Gas men are the only members on many teams wearing shielded helmets.
Auto racing has its own vocabulary. The air going over and under the car affects how it performs. The faster the car goes, the more airflow pushes it against the racetrack and the faster it can corner. Aerodynamics also has become a big part of stock-car racing. Wind-tunnel tests are used to find ways to help the cars slice more quickly through the air.