Route ribbons were built from independent segments, each extended half
a width past both ends and offset into its lane separately, so every
turn drew overlapping, brighter corners. Each route is now one strip
with mitred vertices shared by neighbouring segments (sharp reversals
fall back to the outgoing normal), and its along-distance is exact.
Routes also used to stop at the street door; both ends now continue
to the nearest point of the building's footprint and just inside, so
the path visibly meets the wall of the file it leaves and reaches.
Andy Dixon
eed28b12cd