Junctions, zebras and sidewalks

Lanes stop where a junction begins; painted crossings and tagged sidewalks are drawn, nothing is guessed.

Junctions

A junction is plain, as on a real road: the lanes, their lines and arrows stop where it begins, and the road surface goes on through it. Where it begins is SUMO's (duckOSM's GMNS export cuts each lane there); the lane stays on duckOSM's own line, so it never jumps sideways. Where a lane goes on straight into the lane of the next road (a road that splits into two, two that merge), the two lane lines meet: duckOSM bends the narrower road's lane to its place in the wider one.

The connectors (SUMO's paths from lane to lane through a junction) are not drawn: lane_page(..., connectors=True) adds them unseen, for a page that highlights routes.

Zebras

A crossing duckOSM calls painted (OSM crossing=marked / zebra, crossing:markings) is white stripes across the road it crosses: zebra.stripe_m (0.5 m) wide, zebra.gap_m apart, as long as the crossing is wide, from zoom 17. The stripes are the street's own items: a bridge over the street covers them. An unmarked crossing shows only its footway.

Sidewalks

A sidewalk mapped as its own way (footway=sidewalk) is drawn by roadstyle like any footway. A sidewalk only in a street's tags (sidewalk=left, right or both) is a strip in the walk colour just outside the street, on that side of the OSM way, as wide as sidewalk:width (else sidewalk.width_m, 2 m), from zoom 17; it stops where the street's lanes stop. sidewalk=separate, no, a bare yes and no tag add nothing.