Elevator Parking Simulator

Apartment elevator parking — fixed passenger scenarios, regime Batch evidence, and clear limits of a synthetic ops lab.

Demo

Pick a regime preset (Evening / Morning / High arrival) → Stay → Start, then Compare all and Batch N=100. Prefer Open full screen if the embed feels tight.

Elevator Parking Simulator — fixed scenario compare

Open full screen

Problem

Where should idle elevators wait in an apartment bank? Parking placement is a policy choice; rankings depend on traffic regime.

Strategy	Idle cars go to…
Stay	Last stop
Lobby	Floor 1
Mid	Mid-building
Spread	Even homes along the shaft
Demand	Recent call-heat floors

Approach

Traffic knobs + scenario seed define one passenger stream
Replay / Compare all hold that stream fixed so only parking policy changes
Batch N=100 (seeds 42…141) ranks strategies with sticky hall dispatch
Change one Policy knob; re-run Batch before claiming a win

Metrics: avg / max wait (ticks), empty travel (floors), IdleFrac (parking-sensitive / mixed / saturated), ticks, completed. Rank-by picks the objective — there is no single score.

Results

Evening default vs morning vs saturated high-arrival (REGIME):

Regime	IdleFrac	1st by avgWait	Stay−best gap
Evening (arr 15%, target 80)	54%	Lobby 1.60	4.63
Morning (arr 15%, target 80)	50%	Spread 4.36	4.16
High arrival (arr 90%, target 200)	5%	Mid ≈ pack ~34–35	0.90

Pick parking by regime (Lobby for evening ingress; Spread for morning egress). When IdleFrac is saturated, stop tuning parking — next lever is zoning (documented, not coded). Do not ship a “global best” from one Replay. Parking needs idle time; parking policy is not the same as hall dispatch.

Limitations

Synthetic lab: Bernoulli arrivals, tick time, distance+load hall cost (not group ETA), no real-building calibration. Use for lever separation and fair A/B — not as a vendor-controller replacement study. Batch winRate can exceed 100% on ties.

Stack

Vanilla HTML · CSS · JavaScript · /elevator/

Notes

Takeaways, sticky vs reassign, traffic model

Takeaways

No universal best parking policy — evening Lobby, morning Spread; gaps collapse when saturated
IdleFrac diagnoses parking-sensitive vs saturated regimes
Sticky orphans vs reassign thrash (Mid worse on N=100 sticky vs reassign A/B)
Re-run Batch N=100 before/after one Policy change

Full tree + interview Q&A: /elevator/INSIGHTS.md · 한국어.

Sticky vs reassign: Sticky keeps the first car; Reassign rescores each tick.

E1: MOVING ↑ load 4/8   pickup #76 @16→L1
E3: IDLE @ 20
E4: IDLE @ 20

Evening sticky vs reassign A/B: Stay max wait improves under reassign; Mid mean wait worsens (4.17→5.02) — myopic idle steal.

Traffic model (apartment default): Passenger OD is generated once from the seed + traffic knobs, then reused for Replay / Compare all.

Period	Origin mix (approx.)	Story
Morning egress	~90% upper, ~10% lobby	Leaving
Evening ingress	~90% lobby, ~10% upper	Coming home
Midday / off-peak	~45% lobby, ~55% upper	Mixed

Arrival rate = per-tick Bernoulli (default 15%). Interfloor % = upper→upper chance (default 10%).