jesse
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Four fidelity fixes, all verified in a live Studio datamodel (not just built): 1. Wire up the dead `bridge` flag. Circuit.luau marks 474 samples as bridge spans but nothing ever read the field, so every elevated metre rendered as the same slab on square columns. Flagged spans now get a steel box girder (鋼箱桁橋) with stiffener ribs under the deck, carried on a transverse pier cap and round columns at a wider pitch than the viaduct pillars. 2. Ginza 跨道橋. The Ginza section sits below street level in the filled-in 楓川・築地川 river beds and the surviving city bridges cross over it, their piers landing in the median. Adds the crossing decks, parapets and centre piers -- which is the physical reason lane changes are banned there, not just a paint choice. 3. Junction speed plates. 江戸橋JCT内 / 浜崎橋JCT内 / 京橋JCT-旧白魚橋乗継所 are posted 40 km/h, not the 50 km/h mainline limit; plates repeat more often through the short restricted stretches. 4. Shiodome JCT -> Hamazakibashi JCT widened to 3+3 lanes via widthAt(), with a taper (max ~1.7 studs/sample) instead of a step. Every fixed-width consumer -- deck, median, parapets, lane marks, signage offsets, skyline setback, finish line -- now reads widthAt() so nothing floats or clips. Verified headlessly (tools/verify_c1_fixes*.luau): girders 488 / 474 flagged samples, pier caps 85, columns 80 Ginza overpasses 7, piers 7, lateral offset from centreline 0.000 studs speed plates 40km/h x7, 50km/h x8 deck width Shiodome 81.5 vs Kasumigaseki 60.0 seam lip max 0.0006, road-surface raycast step max 0.260, 0 deck holes Two earlier "failures" were bad tests, not bad geometry, and the fixed harnesses document the traps: deck parts are pitched by CFrame.lookAt so Position.Y+Size.Y/2 is not the surface height (and LookVector is -Z, so the end faces are easy to swap), and a seam raycast must filter to the Expressway folder or it hits TunnelCeiling/MedianFence and reports a phantom 19-stud step.
97 lines
5.1 KiB
Markdown
97 lines
5.1 KiB
Markdown
# Japanese expressway road-standard reference (verified)
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Compiled 2026-08-01 for the Tokyo Wangan Racing circuit. Every figure here was
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read from a primary standard or an official sign artwork file, **not** from
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recollection. Where a commonly-repeated number turned out to be wrong, that is
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called out explicitly, because the wrong versions are widespread online.
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## Road markings — 全標協 (Japan Road Marking Association) 2012 / 2018
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| Element | Spec | Source |
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|---|---|---|
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| 車線境界線 lane boundary (dashed) | line length **3–10 m**; gap **1×–2× the line length**; width **10–15 cm** (15 cm "desirable") | 全標協 2012 p.42 |
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| Lane boundary where overtaking undesirable (屈曲部/curves) | becomes **solid** instead of dashed | 全標協 2012 p.42 |
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| Boundary vs 変速車線 (accel/decel lane at ramps) | length **2 m** (3 m on decel lanes), width **45 cm** | 全標協 2012 p.42 |
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| 導流帯 gore / zebra hatching | **45 cm** white solid bars repeated every **1.0 m**; bounded by a 15–20 cm edge line | 全標協 2018 pp.97–98 |
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| Zebra around an obstruction | 45 cm bars at 1.0 m, guided by arrows upstream | 全標協 2018 |
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| Dashed extension of edge line through intersections | width 15–30 cm, line+gap every 0.5–2.0 m | 警察庁 2014 p.11 様式4 |
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**Correction to a widely-repeated claim.** The "45 cm wide lines on expressways"
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figure that circulates online is *not* the lane boundary — 全標協 2012 p.42 gives
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45 cm only for the boundary between a through lane and a **変速車線**
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(acceleration/deceleration lane). Applying 45 cm to ordinary lane dividers makes
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the road look like it is all ramp. Lane dividers are 15 cm.
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**On 8 m / 12 m.** The standard specifies a *range* (3–10 m line, gap 1–2×), not a
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single value. 8 m line / 12 m gap sits inside that range at the high-speed end
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(gap = 1.5× line) and is the configuration used at expressway speeds; a 5 m/5 m
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rhythm reads as a surface street. Treat 8/12 as "a legal expressway
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configuration", not as "the one legally mandated number".
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## Colour values — sampled from official sign artwork, not estimated
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| Use | Value |
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|---|---|
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| Guide sign (案内標識) green | **#005D35** |
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| Shutoko route badge green | **#007F1F** |
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| Sign lettering | white #FFFFFF |
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Japanese **expressway** guide signs are green; ordinary-road guide signs are
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blue. Shutoko uses green.
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## Speed limits (from the route articles' own signage tables)
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| Route | Posted |
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|---|---|
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| C1 都心環状線 (Inner Circular) | **50 km/h** mainline, **40 km/h** inside the junction sections — 江戸橋JCT内, 浜崎橋JCT内, and 京橋JCT–旧白魚橋乗継所 are each posted 40 in the route's own 車線・最高速度 table |
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| B 湾岸線 (Bayshore/Wangan) | **80 km/h** (60–70 in places) |
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The C1 and the Wangan are **not** the same limit — a C1-shaped circuit should be
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posted 50, not 80.
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## Caveats / not verified
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- Lamp pole spacing (~35 m) and parapet heights are reasonable engineering
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values but were **not** confirmed against a primary source; they are tuned by
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eye for gameplay readability.
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- Asphalt/concrete RGB values in MapBuilder are art direction, not measured
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photometry. Porous asphalt (排水性舗装) does read darker and coarser than
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ordinary asphalt, which the palette reflects.
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## Structural sections of the C1 (drives MapBuilder geometry)
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The C1 is not a uniform elevated tube — it changes structural type along its
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length, and the circuit now renders each type differently.
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| Section | Real-world form | In-game |
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|---|---|---|
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| Elevated viaduct (most of the loop) | Deck on concrete columns | `Pillar` every 3rd sample above Y=18 |
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| Bridge spans (474 flagged samples) | Steel box girder 鋼箱桁橋 over the old canals | `BridgeGirder` + `GirderRib` under deck; `PierCap` + round `PierColumn` on a 6-sample pitch |
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| Ginza 銀座 | Runs **below** street level in the filled-in 楓川・築地川 river beds; surviving city bridges cross **over** it, piers landing in the median | `GinzaOverpass` + `OverpassParapet`, `OverpassPier` in the median |
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| Tunnel sections | Bored/cut-and-cover | Tunnel bore, ceiling, no sky lighting |
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Girder depth is set from the span/depth rule of thumb for steel box girders
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(≈1/20 of span): at ~35 m spans that is ~1.8 m ≈ 6.4 studs (`GIRDER_H`).
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**Why Ginza bans lane changes.** The no-lane-change marking through Ginza is not
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arbitrary styling — the crossing bridges' piers physically occupy the median
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between the carriageways, so the lanes are separated by structure. The yellow
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line and the `OverpassPier` geometry are two expressions of the same fact.
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## Lane counts
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| Section | Lanes |
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|---|---|
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| Most of C1 | 2 + 2 |
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| Shiodome JCT → Hamazakibashi JCT | **3 + 3** (widened; carries the merge from the Haneda line) |
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Rendered by `widthAt(i)`: 60 studs baseline, 82 studs in `WIDE_ZONES`, with a
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taper between so the widening never steps more than ~1.7 studs per sample.
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## Method note
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Wikipedia article *extracts* (`prop=extracts`) silently drop the infobox and
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table markup that carry these figures — the measurements only appear in the raw
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wikitext (`prop=revisions&rvslots=main`). Query the wikitext when hunting for
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specs.
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