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There is an established pit road speed limit for each race. Since NASCAR cars do not have speedometers, the first pace lap of each race is run at pit road speed so drivers can get a tachometer reading for pit speed. There are a variety of other safety rules (see penalties above) that must be followed.
By April 1991, NASCAR implemented the current policy of pit road speed limits. The speed limit depends on the size of the track and the size of pit road. NASCAR uses an electronic scoring system, similar to the VASCAR system, to monitor the speeds of cars on pit road by measuring the time it takes to get from checkpoint to checkpoint. The cars ...
The most common penalty for a pit infraction is a "drive-through": the driver must enter the pits again, under the green flag, and maintain the pit speed limit for the entire length of pit road. If a car stalls, the pit crew may provide a push start , but the car cannot be pushed beyond three pit stalls ahead of its own, or beyond the pit exit ...
The rule was waived if NASCAR called a "quickie caution". A new pit speed limit was implemented, and for the remainder of the 1991 season, cars would be run through pit road for tachometer readings. The use of a "second" pace car during cautions for the pit road (to control the speed) was abandoned. The pit speed limit was in place for all ...
Pit road at Infineon in 2005. The standard, full length road course at Sonoma Raceway is a 2.520 mi (4.056 km) 12-turn course. This course was utilized by all competition through 1997. Most races, including the Grand Prix of Sonoma, use the full course.
All entries utilized 4.0 L normally aspirated engines, with a rev limit of 10,300 rpm. This was the last year for use of the first generation IRL chassis, which were introduced in 1997. For 1999, the pit road speed limit was reduced to 80 mph. [3] From 1992 to 1998, the speed limit had been 100 mph.
The next time around, the pits will be open to lapped cars. The pit road speed limit was reduced from 110 mph to 80 mph, and stop-and-go penalties were replaced with the drive-through penalty. Two-wide restarts will be utilized, with lead lap cars on the outside, and lapped cars to the inside.
Within a few years, after a succession of incidents on the Indy car circuit, as well as in NASCAR, pit road speed limits would be implemented to curtail excessive speeding through the pit lane. In addition the pneumatic jacks built into the cars were found to be embedding themselves into the soft asphalt of the pit lane.