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fix(lane-status): drop busy TTL 90s -> 5s (camera re-fires ~1s)

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Measured the real re-fire rate on the camera: while a vehicle is in the
zone it POSTs `active` about every ~1 second (not the ~30-80s I'd guessed).
The camera sends no leave signal, so "free" is timeout-driven — but with a
~1s re-fire, 90s made the lane stay red for a minute and a half after the
car left. 5s of silence reliably means the car is gone; the light now
clears within seconds. Still override-able via LANE_BUSY_TTL_MS.

Claude-Session: https://claude.ai/code/session_01Xcm6ikLgGoCxxHrxtjkk5V
This commit is contained in:
Julian Çuni
2026-06-22 17:58:25 +02:00
parent e0b9442acc
commit 89542d4ab6
1 changed files with 6 additions and 4 deletions
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apps/server/src/lane-status.ts
+6 -4
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@@ -14,11 +14,13 @@ import { directionOf } from "./device-resolve.js";
// flips free after BUSY_TTL_MS. A "both"-direction camera marks BOTH lanes. // flips free after BUSY_TTL_MS. A "both"-direction camera marks BOTH lanes.
/** How long after the last vehicle detection a lane stays "busy" before clearing. /** How long after the last vehicle detection a lane stays "busy" before clearing.
* Must exceed the camera's `active` re-fire interval (observed ~30-80s on the test * Must exceed the camera's `active` re-fire interval so a still-present car keeps the
* unit) so a parked car keeps the lane busy. Override with LANE_BUSY_TTL_MS. */ * lane busy. Measured on the test unit: while a vehicle is in the zone the camera
* re-fires `active` about every ~1s — so a few seconds of silence reliably means the
* car has left. 5s gives fast clearing without flicker. Override with LANE_BUSY_TTL_MS. */
export function busyTtlMs(): number { export function busyTtlMs(): number {
const raw = Number(process.env.LANE_BUSY_TTL_MS ?? 90_000); const raw = Number(process.env.LANE_BUSY_TTL_MS ?? 5_000);
return Number.isFinite(raw) && raw > 0 ? raw : 90_000; return Number.isFinite(raw) && raw > 0 ? raw : 5_000;
} }
export class LaneStatus { export class LaneStatus {