diff --git a/source/component/plant.py b/source/component/plant.py
index 4ce1e5f..e6e8dd0 100755
--- a/source/component/plant.py
+++ b/source/component/plant.py
@@ -22,7 +22,7 @@ class Car(pg.sprite.Sprite):
     def update(self, game_info):
         self.current_time = game_info[c.CURRENT_TIME]
         if self.state == c.WALK:
-            self.rect.x += 6
+            self.rect.x += 5
         if self.rect.x > c.SCREEN_WIDTH + 25:
             self.dead = True
 
diff --git a/source/state/level.py b/source/state/level.py
index 91c4647..84b31ee 100644
--- a/source/state/level.py
+++ b/source/state/level.py
@@ -1182,7 +1182,8 @@ class Level(tool.State):
                     if (zombie and zombie.state != c.DIE and (not zombie.losthead)
                     and (pg.sprite.collide_mask(zombie, self.cars[i]))):
                         self.cars[i].setWalk()
-                    if pg.sprite.collide_mask(zombie, self.cars[i]):
+                    if (pg.sprite.collide_mask(zombie, self.cars[i]) or
+                    self.cars[i].rect.x <= zombie.rect.centerx <= self.cars[i].rect.right):
                         zombie.health = 0
                 if self.cars[i].dead:
                     self.cars[i] = None