Files

T

jesse 967385261d Rebuild road markings, signage and lighting to verified JP expressway spec

Road markings now follow the 全標協 (Japan Road Marking Association) 2012/2018
standard rather than eyeballed values:

- Lane dividers: 8 m painted / 12 m gap on a continuous 20 m cycle carried
  across segment boundaries (previously each segment restarted its own dash
  phase, so the rhythm broke at every joint).
- Line widths corrected to 0.15 m lane / 0.20 m edge. The 0.45 m width often
  quoted for expressways applies only to the boundary against a 変速車線
  (accel/decel lane) -- now used at ramps only, where it belongs.
- Yellow SOLID no-lane-change lines through tunnels and tight curves, per the
  standard's rule that the boundary goes solid where overtaking is undesirable.
- 導流帯 gore zebra at ramp junctions: 45 cm bars at 1.0 m pitch.

Signage:
- Guide-sign green corrected to the official #005D35; route badges #007F1F.
- Bilingual Japanese + romaji layout (JP above, romaji below).
- Added 規制標識 speed limit plates posted at 50 km/h -- the C1 Inner Circular
  limit. (80 km/h is the Bayshore Route; the two are not the same.)
- Added キロポスト distance markers every 0.5 km.

Lighting/furniture:
- Tunnel lighting changed from blue/teal neon to warm sodium + cool LED runs,
  and made continuous rather than every-other-segment.
- Deck lamps on a ~34 m pitch; added reflective delineator posts.

Verified in-engine by headless measurement, not by inspection: 14/14 geometric
assertions pass (dash length/width, edge width, yellow count, zebra pitch,
light colour, sign colour/bilingual, speed+km posts, markings flush with deck).

Sources and the corrections to widely-repeated wrong figures are recorded in
docs/japanese-road-standards.md.

2026-08-01 17:08:39 -04:00

3.4 KiB

Raw Blame History

Japanese expressway road-standard reference (verified)

Compiled 2026-08-01 for the Tokyo Wangan Racing circuit. Every figure here was read from a primary standard or an official sign artwork file, not from recollection. Where a commonly-repeated number turned out to be wrong, that is called out explicitly, because the wrong versions are widespread online.

Road markings — 全標協 (Japan Road Marking Association) 2012 / 2018

Element	Spec	Source
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
Lane boundary where overtaking undesirable (屈曲部/curves)	becomes solid instead of dashed	全標協 2012 p.42
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
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
Zebra around an obstruction	45 cm bars at 1.0 m, guided by arrows upstream	全標協 2018
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

Correction to a widely-repeated claim. The "45 cm wide lines on expressways" figure that circulates online is not the lane boundary — 全標協 2012 p.42 gives 45 cm only for the boundary between a through lane and a 変速車線 (acceleration/deceleration lane). Applying 45 cm to ordinary lane dividers makes the road look like it is all ramp. Lane dividers are 15 cm.

On 8 m / 12 m. The standard specifies a range (3–10 m line, gap 1–2×), not a single value. 8 m line / 12 m gap sits inside that range at the high-speed end (gap = 1.5× line) and is the configuration used at expressway speeds; a 5 m/5 m rhythm reads as a surface street. Treat 8/12 as "a legal expressway configuration", not as "the one legally mandated number".

Colour values — sampled from official sign artwork, not estimated

Use	Value
Guide sign (案内標識) green	#005D35
Shutoko route badge green	#007F1F
Sign lettering	white #FFFFFF

Japanese expressway guide signs are green; ordinary-road guide signs are blue. Shutoko uses green.

Speed limits (from the route articles' own signage tables)

Route	Posted
C1 都心環状線 (Inner Circular)	50 km/h, dropping to 40 km/h in the tightest junction sections (e.g. Edobashi JCT)
B 湾岸線 (Bayshore/Wangan)	80 km/h (60–70 in places)

The C1 and the Wangan are not the same limit — a C1-shaped circuit should be posted 50, not 80.

Caveats / not verified

Lamp pole spacing (~35 m) and parapet heights are reasonable engineering values but were not confirmed against a primary source; they are tuned by eye for gameplay readability.
Asphalt/concrete RGB values in MapBuilder are art direction, not measured photometry. Porous asphalt (排水性舗装) does read darker and coarser than ordinary asphalt, which the palette reflects.

Method note

Wikipedia article extracts (prop=extracts) silently drop the infobox and table markup that carry these figures — the measurements only appear in the raw wikitext (prop=revisions&rvslots=main). Query the wikitext when hunting for specs.

3.4 KiB Raw Blame History Unescape Escape