FA-68239 / Traffic signal timing plans / Member archive
Loop detector count and occupancy binning: occupied time is measured from vehicle arrival rather than bin start · case 04
Loop detector count and occupancy binning returns a wrong result when occupied time is measured from vehicle arrival rather than bin start.
Case contract
Input {interval s, bins, events: [[on, off]] seconds relative to period start (on may be negative), max_presence, no_activity}. A vehicle is counted in the bin of its on time if inside the period; occupied time is split across bins by overlap; occupancy percent is floor(occupied*100/interval). Status is 'stuck-on' if any presence lasts >= max_presence, 'no-activity' if there are no events and the period (bins*interval) is >= no_activity, else 'ok'. Return {counts, occ_pct, status}.
Why this case matters
Signal timing arithmetic is exact and integer or rational; a wrong rule silently produces unsafe or inefficient timing plans.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| timing oracle 0 | {"counts": [1, 0, 0], "occ_pct": [4, 4, 4], "status": "ok"} | {"counts": [1, 0, 0], "occ_pct": [1, 0, 0], "status": "ok"} | Failed |
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