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Measurements and Calculations
Precise Measurements
- Measure the entire on course route all in one day, from beginning to end.
- Measure under the same conditions as the actual event, as much as possible: same day of week, time of day, same weather, at about the same speeds.
- Record a mileage for every route instruction. (If you also measure the planned off course route, you'll be able to calc the time difference.)
- Use pavement marking paint to mark checkpoint in and out points if there is no specific sign or landmark.
- Record mileage measurements to nearest thousandth, if possible, otherwise to the nearest hundredth of a mile.
- Attach your measuring device's sender unit to the driver's side non-driven wheel to reduce wheel spin error.
Official Mileage
- In the route instructions, clearly display Official Mileage (OM) in a column to the left of the Numbered Route Instruction number.
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OM
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NRI
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0.00
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1.
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"Stop". Begin tire warmup. You have 35.00 minutes to
complete the next 13 NRIs.
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0.21
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2.
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Right at Stop.
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0.30
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3.
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Left at Traffic Light.
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0.42
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4.
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Left at Traffic Light.
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2.10
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5.
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Right at Yield at Springville.
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3.675/ 0.00
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6.
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"Stop". End tire warmup. Begin odometer
calibration transit. Left on Kaiser.
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- In the route instructions, clearly identify when Official Mileage reverts to zero. Official Mileage usually reverts to zero at the beginning of each leg.
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OM
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NRI
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/0.00
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33.
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DIYC at "SMITH COUNTY". CAST 25. (Callback 10 miles)
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Speed Changes
- Speed changes should occur at a specific sign or landmark, or at an official mileage. Speed
changes referenced to a sign or landmark are to be executed at the near edge of the referenced sign or landmark.
- Speed changes referenced to an intersection (such as Traffic Light, Sideroad, or T) may
occur at the leading edge of the intersection, at the stop sign if there is one, or at the apex or center of the intersection, at your discretion; just be consistent and let your contestants
know. (Some clubs or areas have a preference.)
Accurate Calculations
- Accurate TSD calculations are absolutely essential.
- Use a computer spreadsheet.
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NRI
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Begin mile
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End mile
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Distance
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Speed
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Factor
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Interval Time
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Cumulative Time
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CP4 - 41
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0.000
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1.488
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1.488
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45
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1.3333
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1.984
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1.984
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41 - 42
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1.488
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3.010
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1.522
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33
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1.8182
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2.767
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4.751
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Pause LRI F
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0.250
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5.001
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Pause NRI 41
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0.250
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5.251
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Leg 5
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3.010
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5.251
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- Verify spreadsheet calculations with a calculator. Example:
Factor = 60 divided by Speed 60 / 45 mph = 1.3333
Interval time = Distance times Factor 1.488 x 1.3333 = 1.984
- Recheck pauses and speed changes against the final version of the route instructions.
- Run through the event using a rally computer. You should zero every leg.
When things go wrong…
TSD Road Rally is a game of precision. Don't discount a contenstant's claim that your
measurements and calcs are incorrect; listen to their explanation. Have your original measurements and your calcs (preferably on your laptop) with you at the end of the event. Be prepared to review
your calcs for accuracy.
If it is determined that measurements or calculations are in error, if possible, correct the official leg
times and rescore the event prior to issuing awards. If it is not possible to determine correct official time, consider discarding the leg.
If called upon to make a scoring decision, be fair and be generous to the contestants. Send them
home happy and wanting to run your next event.
Related Links
Sample Calculations
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