three sidecar classes. The continental class has a 500 cc single-cylinder engine, also in Great Britain there are left- and right-handed sidecar machines with the engines up to 1000 cc. Sidecar races are some of the most exciting in Grass Track sport, with the driver and passenger working together to obtain the best grip and speed around the corners. Vintage racing Many obsolete race vehicles that were left in barns to rust are being restored to their former glory. The restored race vehicles are being displayed at car shows and sometimes raced. Cars that compete in vintage racing events are from the late 19th century to historic cars from a few years ago. There are more than 170 racing events in North America, and thousands of other vintage events sanctioned by hundreds of clubs. Race program The typical race program usually involves a number of classes, and many tracks offer both open wheel and stock car racing. There are a wide variety of event formats. Hot laps (warm up or practice) These races are 2-5 laps for drivers to get an understanding of the track conditions and the set up of their race cars. They are at the very start of the night before qualifying and the heat races. Qualifying A qualifying session happens before the start of the event. The Lucas Oil Dirt Late Model Series and the World of Outlaw Late Models use the qualifying system to line up their heat races. They give each driver 2 timed laps to get their times. This system is also used to line up the big crown jewel events. For most of the regional series they use the method called the "pill draw." Before the races each driver draws a number and that determines where they start in their heat race. Recently the innovation of Transponder Scoring has brought dirt track racing into the internet immediate post "live" scoring and timing of events (Race Monitor). Heat races Preliminary races for each class, called heat races, frequently open the schedule. The heat races may determine the starting race position in the main events and usually earn season championship points. The heat races are shorter than the feature races, and not as many cars race in each heat, from 8 to 12 laps for a heat race. There are numerous formats for qualifying for the feature event. In a race where they qualify