A tight 180 degree corner that twists back on itself.
2. Handicap
where cars start a race in the reverse order of qualifying, or perceived race pace, usually with timed gaps between cars starting a race. More common in racing's early days than today, the effect was the produce a race result in which all cars would arrive at the race finish together, regardless of the performance of the race vehicle. Another form of handicapping is success ballast, where more successful cars are assessed a weight penalty for every win, and Balance of Power in sportscar racing.
3. Hanford Device
a spoiler attached across the back of the rear wing to greatly increase drag. The result is a massive increase in the slipstream, which improves wheel-to-wheel competition as well as multiple lead changes per lap.
4. HANS Device (Head and Neck Support device)
also known as a head restraint, is a safety item compulsory in many car racing sports. It reduces the likelihood of head and/or neck injuries, such as a basilar skull fracture, in the event of a crash.
5. Heat
A shorter race which decides the participants of the main race and sometimes starting order as well, usually there are more heats in which only a part of the drivers from the entry list take part. Can also mean part of the main race, when it consists of two or more parts.
6. Heel-And-Toe
A driving technique in which the accelerator is operated with the right heel and the brake pedal with the toes of the right foot. This allows the driver to 'blip' the throttle to bring up the engine revolutions to match the transmission revolutions, keeping the drive wheel rotating at a constant speed.
7, Hillbillying
A driving technique in which the car has its front springs higher on the left side than the right side.
8. Holding Up Traffic
When a slower race car causes cars running faster on the track to slow and does not heed the "move over flag" of the race officials.
9. Hooked Up
A car that is performing great because all parts are "hooked up" or working well together.
10. Homologation
Process by which a new vehicle or part of a vehicle is approved by organizers for usage in racing. It also refers to the majority of the world's road racing sanctioning bodies having a racing class following the FIA's Group GT3 formula. This was done to allow a car to be raced in multiple series with no changes.
11. Hot Lap
A car(s) is running at or near racing speed on the course.
12. Hot Pits
A car(s) is/are on the track. Only crew members and racing officials are allowed into the pits for safety reasons.
13. Hung-out-to-dry
Typically used in context to pack racing; a car that pulls out of the "draft train" to make a pass or avoid a potential incident, but ends up losing many positions due to having no "pushers". Numerous cars drafting closely together will drive faster than one car by itself. The lone car hung out to dry sometimes falls all the way to the end of the draft train. Also known as "freight-trained", or when hung out in the middle of two lines of cars, is said to be "in the sucker hole".
14. Hydrolocking
Excessive fuel entering (flooding) one or more cylinders due to abnormal operating conditions. The fuel can not be compressed, causing damage to the motor. Most common in drag racing. May cause the motor to grenade. May also happen if a motor ingests water through the air intake.