This rule meant some races would be greatly extended. In 1998, a CBS-televised race in Pikes Peak scheduled for 186 laps ran 198 laps (12 extra laps) because of multiple attempts, and the last such race, in Gateway International Raceway in 2004, lasted 14 additional laps (16.25 miles). A July 24, 2004 rule change for NASCAR's three national series meant only one "green-white-checkered" finish can be attempted, and the race can end under yellow in one of four situations—inclement weather, darkness, the yellow flag waving because of an incident during the final lap of a race, or the yellow flag waving after the one attempt at green-white-checkered begins. This was later extended by NASCAR to three attempts. (Although reducing the Truck Series attempts at a green-white-checkered finish to one, the rule change was part of NASCAR's implementation of the rule to the Cup and Busch Series due to complaints regarding NASCAR's policy at the time regarding late race cautions; the policy stated that a red flag would be thrown during a late race caution to attempt to ensure the race would finish under green but if a caution occurred after the window for the red flag, the race would end under caution regardless of where the incident occurred or how severe it was). Ironically, the first Truck Series race under the new rules ended with a yellow flag on the final lap. In 2014, NASCAR banned tandem drafting, a method of racing in which two vehicles would line up with each other to gain speed, from the Truck Series. Drivers who commit the act are black-flagged. In the 2016 season, the Truck Series experimented with a "caution clock" rule, under which a caution would be thrown after every 20 minutes of green flag racing. No free pass was awarded for these cautions, and the 20-minute clock was reset upon all restarts. The caution clock was not used during the final 20 laps (10 laps at Pocono or Canadian Tire Motorsports Park) of the race, nor was it used during the Eldora Dirt Derby due to its format. In 2017, it was replaced with the stage system adopted by all other NASCAR national series that season. Initially, the Truck Series competed primarily on short tracks and tracks in the Western United States; the series' inaugural schedule included races at tracks in Arizona, California, Colorado, Oregon and Washington, with only five races in the Southeastern U.S., such as Louisville Motor Speedway, which was not run by the Cup Series.