Depending on the driver's skill, some drivers are allowed to pace the field right up to the dropping of the green flag. Depending on the type of airbag system, potassium chloride may also be present. Rossi, who was to start the race from the pole position and was directly behind the pace car when the incident occurred, was the only driver to drive past the crash and returned to pit road afterwards, causing concern to his crew that he may have run over debris from the crash causing a puncture (though no damage to his car or tires was done). This allows each driver to note the RPM at which pit road speed is maintained. Drivers exceeding that speed on pit road will be penalized, typically a "drive-through" or "stop and go" penalty, costing them valuable track position. Sometimes, a large diesel exhaust pipe is vertical to blow the hot, toxic gas well away from people; in such cases, the end of the exhaust pipe often has a hinged metal flap to stop debris, birds, and rainwater from falling inside. Early Chevrolet cars had the starter pedal to the right of the accelerator, with a secondary throttle control knob on the dashboard because it was difficult to operate the starter pedal and pump the gas pedal at the same time.
Sparks were seen emanating from Montoya's car right before its hard collision with the jet dryer trailer and left driver's side of the truck. Furthermore, two E46 BMW M3 GTRs were damaged: one on the outside line hit the rear of the Marcos, and the other, on the inside line, slightly damaged its front right. The entire incident took about two hours to clean up before the last 40 (later extended to 42 due to a Green-white-checkered finish) laps were able to be completed. After previous being trialed at the NASCAR All-Star Race, at the 2009 Pocono 500, NASCAR introduced a new "Double-file restart" rule that lines the field two cars on each row on every restart, similar to the start of the race, instead of lead-lap cars on the outside and lapped cars on the inside. Approximately 20 minutes after the crash, the cars that were still on the track had their engines re-fired and were directed to drive to pit road in order to reset the starting grid for the race start.
The Beneficiary will regain his lap once pit road opens. Since NASCAR does not allow speedometers or electronic speed limiting devices, the pace car circles the track at pit road speed during the warm-up laps. Volvo's lane departure warning system uses a camera to track road markings and sound an alarm when drivers depart their lane without signaling. Other famous NASCAR pace car drivers include Robert "Buster" Auton and Elmo Langley. The Seat Leon was released too late, allowing the leading Marcos LM600 to pass while erroneously identifying the Audi TT DTM in 2nd and Mosler MT900R GT3 in 3rd as 'the leading pack.' Race officials immediately realized their mistake, and the safety car was instructed to slow down and let the entire field pass. The front running LMPs slowed down but some of the GT cars could not react fast enough, resulting in collisions and heavy damage to all three GTE Pro class Porsches which caused them to retire. A succession of first-lap accidents caused the safety car to be placed on standby, with yellow flags waving on the start-finish section of the track.
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