start playing around with manchester

data/other_polygons/manchester.poly

@@ -0,0 +1,13 @@
+manchester
+1
+     -2.2376060485839844    53.492079751245775
+     -2.2594070434570312    53.4881987411108
+     -2.2638702392578125    53.48038457774244
+     -2.2662734985351562    53.47139395589252
+     -2.2550296783447266    53.46592713537304
+     -2.234172821044922    53.46771542518253
+     -2.2224998474121094    53.47231353875611
+     -2.2232723236083984    53.48370449621052
+     -2.2376060485839844    53.492079751245775
+END
+END

docs/new_city.md

@@ -19,6 +19,9 @@ If you have an Osmosis polygon filter (see below), you can also pass
 first make sure your .osm has been clipped:
 `osmconvert large_map.osm -B=clipping.poly --complete-ways -o=smaller_map.osm`.
 
+You can also try `--oneshot_drive_on_left`, but you'll spot some bugs. Get in
+touch if you need these fixed soon or want to help.
+
 ## Including the city by default
 
 1.  Make sure you can run `import.sh` -- see

importer/src/main.rs

@@ -19,6 +19,7 @@ struct Job {
 
     oneshot: Option<String>,
     oneshot_clip: Option<String>,
+    oneshot_drive_on_left: bool,
 }
 
 fn main() {
@@ -44,6 +45,7 @@ fn main() {
         // Ignore other arguments and just convert the given .osm file to a Map.
         oneshot: args.optional("--oneshot"),
         oneshot_clip: args.optional("--oneshot_clip"),
+        oneshot_drive_on_left: args.enabled("--oneshot_drive_on_left"),
     };
     args.done();
     if !job.osm_to_raw
@@ -60,7 +62,7 @@ fn main() {
     }
 
     if let Some(path) = job.oneshot {
-        oneshot(path, job.oneshot_clip);
+        oneshot(path, job.oneshot_clip, !job.oneshot_drive_on_left);
         return;
     }
 
@@ -147,7 +149,7 @@ fn main() {
     }
 }
 
-fn oneshot(osm_path: String, clip: Option<String>) {
+fn oneshot(osm_path: String, clip: Option<String>, drive_on_right: bool) {
     let mut timer = abstutil::Timer::new("oneshot");
     println!("- Running convert_osm on {}", osm_path);
     let name = abstutil::basename(&osm_path);
@@ -164,7 +166,7 @@ fn oneshot(osm_path: String, clip: Option<String>) {
             gtfs: None,
             elevation: None,
             clip,
-            drive_on_right: true,
+            drive_on_right,
         },
         &mut timer,
     );