TSD rally
Time-Speed-Distance rally: a regularity format in which prescribed averages, derived from time, speed and distance, must be kept exactly.
TSD stands for Time-Speed-Distance. A TSD rally is a form of regularity rally in which teams must cover prescribed route sections at exactly specified average speeds. From the three quantities time, speed and distance it follows when a team should be at a given point – speed is explicitly not the goal.
Checking takes place at – often secret – control points, where the deviation from the target time is scored to the second or fractions of a second; every deviation brings penalty points. The format is especially widespread in North America and places high demands on navigation, clean distance measurement and precise keeping of the averages. Aids are the tripmeter, stopwatch and average-speed tables, and increasingly specialised rally computers.
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Related terms
Prescribed time
Time set by the organiser within which a section or task must be completed – closely related to the target time (Sollzeit).
Time card
Control card issued by the organiser on which arrival and passage times are recorded or stamped at the controls.
Pursuit start
Pursuit start: a start format in multi-stage events where start order and gaps reflect the deficit from previous results – the leader starts first.