Controlled in/out test on the camera: the `active` re-fire rate is
MOVEMENT-driven, not steady — ~1-3s apart while the car moves, but up to
~15-25s when it sits MOTIONLESS in the zone. A 5s TTL would flicker a
parked car free; the TTL must exceed the still-car gap. The camera has
~no dwell lag (goes silent within ~1s of the car leaving — measured: last
event 16:15:17 vs car-left ~16:15:30), so 30s keeps a motionless car busy
while clearing promptly after departure. This also confirms vision-based
tracking isn't warranted: the camera's leave signal is already tight.
Claude-Session: https://claude.ai/code/session_01Xcm6ikLgGoCxxHrxtjkk5V
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
A Hikvision vehicle detection (eventType=VMD, targetType=vehicle) on a
camera bound to entry/exit now marks that lane "busy" and shows it as a
barrier light beside the scan input on the booth (green=free, red=busy).
Advisory only — it gates nothing (never blocks a ticket or opens a barrier).
- Parse eventState (active/inactive) from the Hik payload.
- LaneStatus tracker: a vehicle `active` event marks the camera's bound lane
busy + arms an auto-clear timer. This camera class sends no leave/`inactive`
signal, so "free" is timeout-driven (LANE_BUSY_TTL_MS, default 90s; the
camera re-fires `active` while a car sits there, refreshing the timer). A
"both"-direction camera marks both lanes.
- Push lane-status over the existing booth WS (+ in the hello snapshot);
live-store holds { entry, exit }; two BarrierLight icons render it.
- i18n booth.laneEntry/laneExit (sq + en).
Tests: lane-status.test.ts (7 — busy/free, TTL auto-clear, timer re-arm,
no re-emit while busy, both/exit direction, unknown device). server 120/120;
web + server build/lint green.
Claude-Session: https://claude.ai/code/session_01Xcm6ikLgGoCxxHrxtjkk5V
julian