recalculate stop signs when lanes change; construction->driving was

breaking the west seattle bridge. fixes #68. include a built-in proposal
to fix the bridge. ;)

docs/west_seattle/proposal.md

@@ -1,6 +1,6 @@
 # West Seattle mitigations
 
-_Draft, updated May 14, 2020 by Dustin Carlino (<dabreegster@gmail.com>)_
+_Draft, updated June 23, 2020 by Dustin Carlino (<dabreegster@gmail.com>)_
 
 In March 2020, the West Seattle bridge was closed due to cracks forming. As of
 May, COVID-19's impact on commuting means the area still hasn't seen how the
@@ -55,7 +55,8 @@ Once the simulation is running smoothly, A/B Street can be used to make changes
 part of the road into a bus lane -- and evaluate the effects on individual trips
 and aggregate groups.
 
-## Next steps
+## Repair the bridge
 
-It'd be useful to first get a baseline with the high bridge restored. Should now
-be possible using edits.
+Community proposals now includes a "repair the bridge" option, which should
+restore things to how they were before March 2020. This is useful as a baseline,
+to explore what traffic patterns were like before the closure.

game/src/pregame.rs

@@ -353,7 +353,8 @@ impl Proposals {
                 buttons.push(
                     Btn::text_bg2(&edits.proposal_description[0])
                         .tooltip(Text::new())
-                        .build(ctx, &name, None),
+                        .build(ctx, &name, None)
+                        .margin_below(10),
                 );
             }
 

map_model/src/map.rs

@@ -1375,8 +1375,13 @@ fn recalculate_turns(
     // TODO Deal with turn_lookup
 
     match i.intersection_type {
-        // Stop sign policy doesn't depend on incoming lane types. Leave edits alone.
-        IntersectionType::StopSign => {}
+        IntersectionType::StopSign => {
+            // Stop sign policy usually doesn't depend on incoming lane types, except when changing
+            // to/from construction. To be safe, always regenerate. Edits to stop signs are rare
+            // anyway. And when we're smarter about preserving traffic signal changes in the face
+            // of lane changes, we can do the same here.
+            map.stop_signs.insert(id, ControlStopSign::new(map, id));
+        }
         IntersectionType::TrafficSignal => {
             map.traffic_signals
                 .insert(id, ControlTrafficSignal::new(map, id, timer));