Editing Auto racing (section)

===Drag racing===
{{Main|Drag racing}}
[[File:Tarlton-Drag racing-004.jpg|thumb|Jet-propelled [[drag racing|dragster]] in Tarlton, Gauteng, South Africa]]
[[File:1970 AMC Javelin dragstrip car-r.jpg|thumb|Two modified [[American Motors Corporation|AMCs]] launching at a [[dragstrip]]]]

In drag racing, the objective is to complete a given straight-line distance, from a standing start, ahead of a vehicle in a parallel lane. This distance is traditionally {{convert|1/4|mi|m}}, though {{convert|1000|ft|m}} and {{convert|1/8|mi|m}} are also common. The vehicles may or may not be given the signal to start at the same time, depending on the class of racing. Vehicles range from the everyday car to the purpose-built [[drag racing|dragster]]. Speeds and elapsed time differ from class to class. Average street cars cover the {{frac|4}} mile in 12 to 16&nbsp;seconds, whereas a [[top fuel dragster]] takes 4.5&nbsp;seconds or less, reaching speeds of up to {{convert|530|km/h|0|abbr=on}}. Drag racing was organized as a sport by [[Wally Parks]] in the early 1950s through the [[National Hot Rod Association]] (NHRA). The NHRA was formed to discourage [[street racing]].

When launching, a top fuel dragster will accelerate at 3.4 [[g-force|g]] (33&nbsp;m/s<sup>2</sup>), and when braking parachutes are deployed the deceleration is 4&nbsp;g (39&nbsp;m/s<sup>2</sup>), more than the [[Space Shuttle]] experiences. A top fuel car can be heard over {{convert|8|mi|km}} away and can generate a reading from 1.5 to 3.9 on the [[Richter magnitude scale|Richter scale]].<ref>{{cite web| url=http://topfuel.nhra.com/blog/nhra-notebook/2007/07/26/22660/ | title=Herbert's engine thunders to 3.9 on Richter scale | date=July 26, 2007 | work=NHRA.com | access-date=August 11, 2010 }}{{dead link|date=March 2018 |bot=InternetArchiveBot |fix-attempted=yes }}</ref>
<!-- Need more details to verify this reference:<ref>NHRA Mile High Nationals 2001, and 2002 testing from the National Seismology Center.</ref> -->

Drag racing is two cars head-to-head, the winner proceeding to the next round. Professional classes are all first to the finish line wins. Sportsman racing is handicapped (slower car getting a [[Head start (positioning)|head start]]) using an index (a lowest e.t. allowed), and cars running under (quicker than) their index "break out" and lose. The slowest cars, bracket racers, are also handicapped, but rather than an index, they use a [[Drag racing#Dial-in|dial-in]].