held, and a celebrity driver is usually used for the start of the race only. In the last 50 years, the Pontiac Trans Am, Chevrolet Camaro, Chevrolet Corvette, Oldsmobile Cutlass, and Ford Mustang are the only models that have been selected as pace cars three or more times. During the IndyCar Series season, however, Johnny Rutherford, Sarah Fisher, and Oriol Servià are the normal drivers of the IRL pace car for all events. The pace car is deployed for debris, collision, or weather reasons. Since 1993, upon the waving of the yellow flag, pit road is closed until the pace car picks up the leader and passes the pit entrance the first time, unless track blockage forces the field to drive through pit lane. Another duty of the pace car is to lead the field around the course on parade laps prior to the start of the race. These increase in speed, allowing for a flying start of the race. Furthermore, two other rule changes have been implemented. Since 2000, with one lap to go before going back to green, the pace car pulls off the track in turn one rather than in turn four. The current leader of the race is then assigned the task of pacing the field back to the green flag. After much consideration, this rule was added to prevent a situation much like the one that happened in the 1995 Indianapolis 500, when Scott Goodyear passed the pace car going back to green. In 2002, another rule was added. With one lap to go before the green, the pace car waves by all cars (if there are any) between the pace car and the actual leader of the race. This allows for the leader to control the restart without lapped cars being in front of him. It also creates a strategy for cars to gain laps back, loosely resembling the "Lucky dog" rule. However, the cars who get waved around are not allowed to pit until the green flag restarts the race (so they do not get the advantage of getting their lap back AND a free pit stop). NASCAR In all NASCAR series, if the caution is out for debris, accident, or inclement weather, the flagman will display the yellow caution flag and the pace car will pull out of the pits and turn on the yellow strobes on top and/or behind the car.