Proposal 8: Calculation of additional distance in time trial records [ Revision 1 ]
Committee: Review and Update the GuidelinesSubmitted on 2018-12-22
Status: Passed on January 17, 2019
Background
Proposal
OLD RULE (under 5.1.3):
AD = (TL x TR) / LL
NEW RULE (same place under 5.1.3)
AD = TL x (TR / LL).
Body
A time trial record attempt (that is, an attempt to ride the greatest distance in a fixed time - the so-called set-time) must be done on a closed circuit. Only the passages across the finish line are timed. Usually, the rider will complete a whole number of laps within the set-time, and then is some time left for a partial lap until the set-time is over. He will then complete that last lap, and the final finish passage is also timed.
5.1.3 states a formula to calculate the achieved distance in the part of the very last lap that was within the set-time.
The easiest way to understand this formula is that you first calculate which fraction of the last lap fell within the set-time.
This fraction equals the time remaining to ride at the beginning of the last lap, divided by the time it took to ride the whole last lap.
Next, this fraction is multiplied by the lap length.
By this logic, the brackets should be around (TR / LL), because that is what you calculate first.
Note that mathematically, no brackets are required at all. The calculation result is the same with or without brackets (in whichever position). It's just that having brackets in the right place make the formula a bit easier to understand. Having them in the wrong place serves no purpose whatsoever.
References
Discussion
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Votes on this proposal:
8 out of 9 voting members have voted.
Agree: 7, Disagree: 0, Abstain: 1.