Disable PA on/off ramps; restore mainline to pre-ramp state
Three iterations of the Daikoku PA ramps never read as a real
interchange. Measured why, rather than tuning further:
* the entry and exit decks INTERSECTED -- 2547 sample pairs within
30 studs horizontally at <12 studs dY, worst case 0.5 studs apart
at dY=0.0. On screen that is the bowtie tangle of white rails.
* both real Daikoku ramps turn the SAME way (clockwise; the guide
video says "right, right"). This build mirrored them into each
other.
* the real arc wraps OUTSIDE the lot and forms its north/east
boundary. This build cut across the apron interior.
Gated behind BUILD_PA_RAMPS=false rather than deleted -- the radius
was already correct (470 studs vs an OSM-measured mean of 469) and
the merge lands tangent at 0.1-0.2 deg divergence. Both worth keeping.
Also removed two leftovers that would have outlived the ramps:
* rampOpen punched holes in the mainline's outer parapet, railing
and kill wall for ramps that no longer exist -- a barrier gap with
a drop behind it. Sealed via RAMP_EDGE_OPENINGS=false. Verified:
Barrier/EdgeRail/KillWall = 1646 each = 823 samples x 2 edges,
0 road samples without a guard within 90 studs.
* gore zebra hatching painted 1024 bars + 64 boundary lines marking
a junction that is not there. Sealed via RAMP_GORE_MARKINGS=false.
Verified after a cache-busting fresh rebuild (Studio's require() cache
otherwise serves the previous map and reports a false pass):
parts 22628 -> 15988
all ramp part classes = 0
Road = 823 (unchanged), spawn pad + PASpawn intact
clip probe TRUSTWORTHY (control +11/-0), CLIPPING=0
Research and rebuild spec kept for when this is revisited:
reference/ramps/BUILD_SPEC.md, INDEX.md (10 CC-licensed Commons
photos), docs/daikoku-reference-spec.md (OSM circle fits).
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# Daikoku Futo PA — Measured Reference Spec
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Source-of-truth numbers for building the Daikoku PA entrance/exit ramps and
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apron in `MapBuilder.luau`. Everything here is **measured**, not estimated:
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OSM geometry via Overpass (`/tmp/osm_daikoku.py`), Esri aerial imagery, and
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frame-sampled onboard video.
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Generated 2026-08-03.
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---
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## 1. Scale
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| Quantity | Value |
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|---|---|
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| Project scale | `M = 1/0.28` = **3.571 studs per metre** (`MapBuilder.luau:69`) |
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| Reciprocal | 1 stud = 0.28 m |
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| `Circuit.STUDS_TO_KM` | 0.28 / 1000 |
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> NOTE: `c1_georeference.json` records `scale_studs_per_meter: 4.3` for the C1
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> loop georeference. That is a **different** mapping (real-Tokyo lat/lon → C1
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> world) with a stated `median_error_m: 366`. Do **not** use 4.3 for PA
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> geometry. PA work uses 3.571.
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---
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## 2. The real PA footprint (OSM)
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Overpass, bbox 35.4545/139.6700 → 35.4705/139.6935. ENU metres about
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`35.46246657, 139.68149001` (user's Google Earth point).
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| OSM way | Type | Extent (m) | Perimeter | Name |
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|---|---|---|---|---|
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| `405966005` | `highway=rest_area` | **203 × 227** | 646 m | 大黒PA |
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| `59608205` | `amenity=parking` | **181 × 174** | 507 m | 大黒ふ頭パーキングエリア |
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| `88702527` | `amenity=parking` | 102 × 107 | 359 m | (satellite lot, W of main) |
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**Current build:** apron is `APRON_X = 210*M`, `APRON_Z = 200*M`
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(`MapBuilder.luau:991`) = 210 × 200 m. That sits between the parking polygon
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(181×174) and the rest_area polygon (203×227) — **already a good match.** The
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apron extent is not the problem.
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The *shape* is the divergence: the build is an axis-aligned square; the real
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lot is a rounded wedge bounded on the N/E by the loop ramp arc.
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---
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## 3. Loop ramp radii — MEASURED
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Kasa circle fit over each OSM ramp way with |cumulative turn| ≥ 120°.
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`rms` = fit residual (low = genuinely circular).
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| OSM way | Length | Turn | **Radius** | rms | Layer | Direction |
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|---|---|---|---|---|---|---|
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| `32355896` | 475 m | −272° | **70.9 m** | 14.4 | — | CW / right |
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| `32403901` | 601 m | −217° | **147.4 m** | **1.2** | 5 | CW / right |
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| `32592491` | 729 m | +208° | **197.4 m** | 12.7 | 2 | CCW / left |
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| `307397558` | 167 m | −178° | **27.5 m** | 9.0 | — | CW / right |
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| `779045459` | 371 m | +161° | **123.6 m** | **0.7** | 3 | CCW / left |
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| `32403902` | 656 m | −150° | **204.2 m** | 13.3 | 3 | CW / right |
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| `32592481` | 359 m | −146° | **120.4 m** | 12.0 | 1 | CW / right |
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| `32592487` | 488 m | −122° | **158.8 m** | 11.3 | 2 | CW / right |
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**Headline numbers**
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- Radius range **27.5 – 204 m**; mean **131 m** = **469 studs**
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- The two cleanest circular fits (rms < 1.5) are the true helixes:
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- `32403901` — **147 m** (526 studs), 217° of turn, layer 5
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- `779045459` — **124 m** (441 studs), 161° of turn, layer 3
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- **6 of 8 curve clockwise (right).** Matches the video captions exactly:
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`右、右と覚えておくとPAに着きます` — "remember right, right".
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**Recommended build values**
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| Ramp | Radius (m) | Radius (studs) | Turn |
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|---|---|---|---|
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| Main entry helix | 147 | **525** | ~220° CW |
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| Secondary helix | 124 | **440** | ~160° CCW |
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| Tight connector | 71 | **255** | ~270° CW |
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Current `Circuit.PA_RADIUS = 260` studs = 72.8 m — which is almost exactly the
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tight connector (`32355896`, 70.9 m). The *main* helixes are roughly 2× that.
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---
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## 4. Deck layers — the vertical stack
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OSM `layer` tags on bridge ways in the interchange:
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| Layer | Bridge ways | Total length |
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|---|---|---|
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| 1 | 11 | 17,696 m |
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| 2 | 7 | 5,637 m |
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| 3 | 8 | 5,368 m |
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| 4 | 10 | 10,096 m |
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| 5 | 6 | 1,417 m |
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**Five distinct deck levels.** This is the single most important structural
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fact: Daikoku JCT is a five-level stack, and the PA sits at the bottom of it.
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Current `Circuit.PA_LIFT = 56` studs (15.7 m) of clearance over the apron —
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that is one level. A faithful build wants at least 3 visible levels overhead.
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Typical Japanese expressway deck-to-deck spacing is ~10–12 m; at 3.571 studs/m
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that is **36–43 studs per level**.
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---
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## 5. Video-derived detail
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Sources archived at
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`unraid-1:/mnt/user/data/yy-roblox-games/0-tokyo-wangan-racing/004-video-reference/`
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| Route | Video ID | Len | Light | Value |
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|---|---|---|---|---|
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| CMT TOKYO "How to go to?" | `91suWmNr62c` | 2m50 | night | narrated turn-by-turn |
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| Bay Bridge up (ベイブリッジ〜大黒PA) | `PK4BachUlYo` | 2m36 | night | full entry sequence |
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| Yokohane down (横羽線下り) | `zlmdaR0opgE` | 5m15 | **day** | best structural read |
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| Honmoku JCT (攻略車載#18) | `fNHucFnFQ1c` | 10m07 | **day** | approach + JCT |
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| Night walkaround | `7i0-KCwMDyc` | 10m40 | night | apron-level atmosphere |
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### Confirmed visual details
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1. **Red/orange chevron shoulder paint** on the outer kerb through every ramp
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curve. Present in all five videos, day and night. Highest-value cheap
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detail available.
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2. **White splayed / V-shaped piers** with trapezoidal box-girder deck
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underside (clearest at `yokohane_down` t=218–242s).
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3. **Chain-link mesh fencing** along ramp edges — not solid barrier. Above a
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low concrete jersey base.
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4. **Green route shields** `大黒線 K5`; blue circular regulatory signs;
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`50` km/h limit discs on ramps.
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5. **`/P` + up-right arrow gantry** marks the parking entry (`91suWmNr62c`
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t=104s).
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6. Apron at night: warm sodium pole lighting, **white stall lines clearly
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visible**, painted directional arrows, low guardrail perimeter.
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7. Arrival reads as **descending into a canyon** — decks close in overhead.
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---
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## 6. Gaps / not yet measured
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- **Deck heights above ground.** OSM `layer` gives ordering, not elevation.
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Needs either a DEM lookup or estimation from video pier counts.
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- **Third approach route.** Confirmed to exist (video states "3 ways"); two
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are captured in full, the Honmoku run covers the approach only.
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- **Exit ramp geometry.** All captured footage is *entry*. Exits not yet
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sampled.
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- **Stall grid angle.** Aerial shows a diagonal ~40–45° grid; exact bearing
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not yet fitted.
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---
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## 7. Reproduce
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```bash
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python3 /tmp/osm_daikoku.py # OSM geometry + circle fits
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python3 /tmp/route.py <videoid> <name> <step_s> # video -> contact sheets
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python3 /tmp/sat.py # Esri aerial tiles
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```
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