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.
jesse
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