diff --git a/game/src/edit/bulk.rs b/game/src/edit/bulk.rs
index c6d8ee6f66..c86ed9d626 100644
--- a/game/src/edit/bulk.rs
+++ b/game/src/edit/bulk.rs
@@ -7,7 +7,7 @@ use ezgui::{
     Outcome, TextExt, VerticalAlignment, Widget,
 };
 use geom::Speed;
-use map_model::{EditCmd, LaneType, RoadID};
+use map_model::{LaneType, RoadID};
 use std::collections::BTreeSet;
 
 pub struct BulkSelect {
@@ -172,10 +172,11 @@ impl State for BulkEdit {
                     let speed = self.composite.dropdown_value("speed limit");
                     let mut edits = app.primary.map.get_edits().clone();
                     for r in &self.roads {
-                        let old = app.primary.map.get_r_edit(*r);
-                        let mut new = old.clone();
-                        new.speed_limit = speed;
-                        edits.commands.push(EditCmd::ChangeRoad { r: *r, old, new });
+                        edits
+                            .commands
+                            .push(app.primary.map.edit_road_cmd(*r, |new| {
+                                new.speed_limit = speed;
+                            }));
                     }
                     apply_map_edits(ctx, app, edits);
                     return Transition::Keep;
diff --git a/game/src/edit/lanes.rs b/game/src/edit/lanes.rs
index db49df4828..3cf88f6232 100644
--- a/game/src/edit/lanes.rs
+++ b/game/src/edit/lanes.rs
@@ -13,7 +13,7 @@ use ezgui::{
     hotkey, Btn, Color, Composite, EventCtx, GfxCtx, HorizontalAlignment, Key, Outcome,
     RewriteColor, TextExt, VerticalAlignment, Widget,
 };
-use map_model::{EditCmd, LaneID, LaneType};
+use map_model::{LaneID, LaneType};
 
 pub struct LaneEditor {
     l: LaneID,
@@ -179,12 +179,13 @@ impl State for LaneEditor {
                 }
             },
             Outcome::Changed => {
-                let r = app.primary.map.get_l(self.l).parent;
-                let old = app.primary.map.get_r_edit(r);
-                let mut new = old.clone();
-                new.speed_limit = self.composite.dropdown_value("speed limit");
                 let mut edits = app.primary.map.get_edits().clone();
-                edits.commands.push(EditCmd::ChangeRoad { r, new, old });
+                edits.commands.push(app.primary.map.edit_road_cmd(
+                    app.primary.map.get_l(self.l).parent,
+                    |new| {
+                        new.speed_limit = self.composite.dropdown_value("speed limit");
+                    },
+                ));
                 apply_map_edits(ctx, app, edits);
                 return Transition::Replace(LaneEditor::new(ctx, app, self.l, self.mode.clone()));
             }
diff --git a/game/src/edit/validate.rs b/game/src/edit/validate.rs
index 0496631eb3..cd99e0bb10 100644
--- a/game/src/edit/validate.rs
+++ b/game/src/edit/validate.rs
@@ -124,10 +124,9 @@ pub fn try_change_lt(
     let mut edits = orig_edits.clone();
     let cmd = {
         let r = map.get_l(l).parent;
-        let old = map.get_r_edit(r);
-        let mut new = old.clone();
-        new.lanes_ltr[map.get_r(r).offset(l)].0 = new_lt;
-        EditCmd::ChangeRoad { r, old, new }
+        map.edit_road_cmd(r, |new| {
+            new.lanes_ltr[map.get_r(r).offset(l)].0 = new_lt;
+        })
     };
     edits.commands.push(cmd.clone());
     map.try_apply_edits(edits, &mut Timer::throwaway());
@@ -174,10 +173,9 @@ pub fn try_reverse(ctx: &mut EventCtx, map: &Map, l: LaneID) -> Result<EditCmd,
     // there aren't weird side effects elsewhere of doing this.
     if (idx != 0 && lanes[idx - 1].1 != dir) || (idx != lanes.len() - 1 && lanes[idx + 1].1 != dir)
     {
-        let old = map.get_r_edit(r.id);
-        let mut new = old.clone();
-        new.lanes_ltr[idx].1 = dir.opposite();
-        Ok(EditCmd::ChangeRoad { r: r.id, old, new })
+        Ok(map.edit_road_cmd(r.id, |new| {
+            new.lanes_ltr[idx].1 = dir.opposite();
+        }))
     } else {
         Err(PopupMsg::new(
             ctx,
diff --git a/game/src/edit/zones.rs b/game/src/edit/zones.rs
index 9ad0729333..60482a03f5 100644
--- a/game/src/edit/zones.rs
+++ b/game/src/edit/zones.rs
@@ -10,7 +10,7 @@ use ezgui::{
     hotkey, Btn, Color, Composite, Drawable, EventCtx, GfxCtx, HorizontalAlignment, Key, Line,
     Outcome, Spinner, Text, TextExt, VerticalAlignment, Widget,
 };
-use map_model::{AccessRestrictions, EditCmd, PathConstraints, RoadID};
+use map_model::{AccessRestrictions, PathConstraints, RoadID};
 use maplit::btreeset;
 use sim::TripMode;
 use std::collections::BTreeSet;
@@ -88,10 +88,11 @@ impl State for ZoneEditor {
 
                     // Roads deleted from the zone
                     for r in self.orig_members.difference(&self.selector.roads) {
-                        let old = app.primary.map.get_r_edit(*r);
-                        let mut new = old.clone();
-                        new.access_restrictions = AccessRestrictions::new();
-                        edits.commands.push(EditCmd::ChangeRoad { r: *r, old, new });
+                        edits
+                            .commands
+                            .push(app.primary.map.edit_road_cmd(*r, |new| {
+                                new.access_restrictions = AccessRestrictions::new();
+                            }));
                     }
 
                     let mut allow_through_traffic = self
@@ -117,10 +118,11 @@ impl State for ZoneEditor {
                         let old_access_restrictions =
                             app.primary.map.get_r(*r).access_restrictions.clone();
                         if old_access_restrictions != new_access_restrictions {
-                            let old = app.primary.map.get_r_edit(*r);
-                            let mut new = old.clone();
-                            new.access_restrictions = new_access_restrictions.clone();
-                            edits.commands.push(EditCmd::ChangeRoad { r: *r, old, new });
+                            edits
+                                .commands
+                                .push(app.primary.map.edit_road_cmd(*r, |new| {
+                                    new.access_restrictions = new_access_restrictions.clone();
+                                }));
                         }
                     }
 
diff --git a/map_model/src/edits/mod.rs b/map_model/src/edits/mod.rs
index 94f6913bbe..e33303983b 100644
--- a/map_model/src/edits/mod.rs
+++ b/map_model/src/edits/mod.rs
@@ -410,6 +410,13 @@ impl Map {
         }
     }
 
+    pub fn edit_road_cmd<F: Fn(&mut EditRoad)>(&self, r: RoadID, f: F) -> EditCmd {
+        let old = self.get_r_edit(r);
+        let mut new = old.clone();
+        f(&mut new);
+        EditCmd::ChangeRoad { r, old, new }
+    }
+
     // Panics on borders
     pub fn get_i_edit(&self, i: IntersectionID) -> EditIntersection {
         match self.get_i(i).intersection_type {