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[traffxml] Code comment

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Signed-off-by: mvglasow <michael -at- vonglasow.com>
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mvglasow
2025-06-06 17:09:11 +03:00
parent 394a6673e5
commit 5531b1129b
1 changed files with 6 additions and 1 deletions
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7
traffxml/traff_decoder.cpp
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@@ -129,7 +129,12 @@ void TraffDecoder::ApplyTrafficImpact(traffxml::TrafficImpact & impact, traffxml
speedKmPH = speed.GetSpeedKmPH(cit->first.GetDir() == traffic::TrafficInfo::RoadSegmentId::kForwardDirection);
}
auto const idx = cit->first.GetIdx();
// TODO sum of all lengths may differ from route length by up to ~6%, no idea why
/*
* TODO sum of all lengths may differ from route length by up to ~6% in either direction.
* This is partly due to the fact that route length also includes fake endings, which we are
* not counting here. However, this only explains routes being longer than the sum of all
* lengths calculated here, yet in some cases the route is shorter.
*/
auto const length = mercator::DistanceOnEarth(points[idx], points[idx + 1]);
if (speedKmPH != routing::kInvalidSpeed)
normalDurationS += length * kOneMpSInKmpH / speedKmPH;