Remove the transformation that shrinks overlapping roads.

docs/how_it_works.md

@@ -96,10 +96,6 @@ There are special cases documented in the code.
 
 A "simple sausage link" is a dual carriageway that split very briefly and then re-joins, with no intermediate roads. These are collapsed into one road between the intersections, with a barrier lane inserted in the middle. The code is well-documented and better reference.
 
-### ShrinkOverlappingRoads
-
-This is a hack to make dual carriageways drawn close together in OSM look half-reasonable, before we successfully merge them. It looks for road polygons that physically overlap, then just halves all lane widths. It doesn't attempt to shift the road center or re-apply placement tags.
-
 ### MergeDualCarriageways (experimental)
 
 TODO. Explain branches and bridges.

osm2streets/Cargo.toml

@@ -5,7 +5,6 @@ authors = ["Dustin Carlino <[email protected]>"]
 edition = "2021"
 
 [dependencies]
-aabb-quadtree = "0.1.0"
 abstutil = { git = "https://github.com/a-b-street/abstreet" }
 anyhow = "1.0.38"
 geom = { git = "https://github.com/a-b-street/abstreet" }

osm2streets/src/transform/mod.rs

@@ -9,7 +9,6 @@ mod intersection_geometry;
 mod remove_disconnected;
 mod sausage_links;
 mod separate_cycletracks;
-mod shrink_roads;
 
 /// An in-place transformation of a `StreetNetwork`.
 pub enum Transformation {
@@ -19,7 +18,6 @@ pub enum Transformation {
     CollapseShortRoads,
     CollapseDegenerateIntersections,
     CollapseSausageLinks,
-    ShrinkOverlappingRoads,
     MergeDualCarriageways,
     GenerateIntersectionGeometry,
 }
@@ -32,7 +30,6 @@ impl Transformation {
             Transformation::CollapseSausageLinks,
             Transformation::CollapseShortRoads,
             Transformation::CollapseDegenerateIntersections,
-            Transformation::ShrinkOverlappingRoads,
             Transformation::GenerateIntersectionGeometry,
             // The above may discover more roads to collapse
             Transformation::CollapseShortRoads,
@@ -73,7 +70,6 @@ impl Transformation {
             Transformation::CollapseShortRoads => "collapse short roads",
             Transformation::CollapseDegenerateIntersections => "collapse degenerate intersections",
             Transformation::CollapseSausageLinks => "collapse sausage links",
-            Transformation::ShrinkOverlappingRoads => "shrink overlapping roads",
             Transformation::MergeDualCarriageways => "merge dual carriageways",
             Transformation::GenerateIntersectionGeometry => "generate intersection geometry",
         }
@@ -100,9 +96,6 @@ impl Transformation {
             Transformation::CollapseSausageLinks => {
                 sausage_links::collapse_sausage_links(streets);
             }
-            Transformation::ShrinkOverlappingRoads => {
-                shrink_roads::shrink(streets, timer);
-            }
             Transformation::MergeDualCarriageways => {
                 dual_carriageways::merge(streets);
             }