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Update Inrix Traffic Modifiers #17

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Merged
boonboonsiri merged 1 commit into from
Jun 30, 2026
Merged

Update Inrix Traffic Modifiers #17

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7 changes: 6 additions & 1 deletion valhalla-traffic-builder/src/InrixTrafficProvider.js
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Original file line number Diff line number Diff line change
Expand Up @@ -134,11 +134,16 @@ class InrixTrafficProvider {

// Inrix Speed Adjustments
// Reference speed is freeflow speed at that datetime

/* Deprecated due to Inrix changes (not needed anymore) 2026-06-29
if (speed / segment.reference <= 0.25) { // Inrix really tends to underestimate heavy heavy traffic. It knows where the traffic jams are, but doesn't make them cost enough 10km/h -> 6km/h
speed = speed * 0.6;
} else if (speed / segment.reference <= 0.4) { // Lighter version of above rule
speed = speed * 0.75;
} else if (segment.reference < 30 && speed / segment.reference < 0.75) { // Apply higher cost to traffic set in downtowns (where segment.reference is very slow)
} */


if (segment.reference < 30 && speed / segment.reference < 0.75) { // Apply higher cost to traffic set in downtowns (where segment.reference is very slow)
speed = speed * 0.65;
} else if (segment.reference < 30) { // Inrix tends to overestimate speed in downtowns
speed = speed * 0.85;
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