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An outdoor track measures 400 meters (m) around, with standard IAAF measurements of 84.39m for the straights and 115.611m for the curves. These distances are typically measured either 20 centimeters (cm) from the inside of the track (if no rail or curb exists on the inside), or 30cm from the inside (if there is a rail or curb in place). One straightaway is extended for the start and finish of sprint races. Two start lines exist on this extension: One for the 110m hurdle race, and one for the 100m races. Tracks should extend a minimum of 3m behind the starting line and 17m after the finish line, leaving room for sprinters to decelerate. A track will have eight lanes. Six and nine lane tracks are also common, while two and four lane tracks are occasionally made. A tenth lane becomes too wide and gives too much advantage to the outside athlete in the 200m, since running a turn is less efficient than running a straight. Tracks used for international competition will always be either eight or nine lanes. Each lane is 1.22m wide.

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