TSD rally is a type of motosport rally with the object of driving each segment of a Course in a specified time at a specified average speed. The rally is usually conducted on public roads, but sometimes includes off-road and track sections. Contestants usually compete in teams composed of an amateur driver and navigator.
|A typical TSD rally may run for a few hours or it may run over a series of stages over a few days.|
|At the start, competitors are usually briefed about the event and may be required to submit their cars for inspection.|
|Each team is given a route schedule prior to departure.|
|This schedule contains information that the navigator will use to try to keep to the specified route and it contains information about the designated speeds and times for each segment of the route.|
|On some rallies, more than one type of schedule may be prepared for different types of competitors.|
|Once a team is prepared, they will usually start the rally at a specific time unique to them.|
|Along the route, the team will encounter marshals. The position of the marshals is usually not known to the teams.|
|The time at which the team arrives at each marshal is recorded and used in the scoring.|
|In some cases the marshals are hidden from view.|
|Teams may also encounter open sections where they are guaranteed not to encounter marshals and are not subject to any time penalties.|
The difference between a team's actual times and the correct times determine their penalties. (Lateness and earliness both attract penalties.) The team with the lowest number of penalties wins.