diff --git a/map_display.py b/map_display.py
index e55fd34..fb714cb 100644
--- a/map_display.py
+++ b/map_display.py
@@ -27,9 +27,6 @@ class MapDisplay:
 
         self.font = pygame.font.SysFont("ubuntu", 20)
 
-        for city in self.cities:
-            self.draw_city(*city)
-
     def real_to_screen(self, lon: float, lat: float) -> tuple[float, float]:
         x = (lon - self.min_lon) / (self.max_lon - self.min_lon)
         y = (lat - self.min_lat) / (self.max_lat - self.min_lat)
@@ -65,6 +62,10 @@ class MapDisplay:
 
         pygame.draw.lines(self.surf, (255, 255, 255), True, points)
 
+    def draw_cities(self) -> None:
+        for city in self.cities:
+            self.draw_city(*city)
+
     def draw_city(self, pos: Vec2, name: str, label_side: str) -> None:
         pos2 = Vec2(*self.real_to_screen(pos.x, pos.y))
 
@@ -94,3 +95,33 @@ class MapDisplay:
 
         pygame.draw.line(self.surf, (255, 255, 255), (pos2.x, pos2.y), (line_end.x, line_end.y))
         self.surf.blit(label, (label_pos.x, label_pos.y))
+
+    def mainloop(self) -> None:
+        running = True
+
+        self.init_interactive()
+
+        clock = pygame.time.Clock()
+        while running:
+            for event in pygame.event.get():
+                if event.type == pygame.QUIT:
+                    running = False
+
+                elif event.type == pygame.KEYDOWN:
+                    if event.key == pygame.K_ESCAPE:
+                        running = False
+
+                    elif event.key == pygame.K_s and event.mod & pygame.KMOD_CTRL:
+                        path = "/tmp/image.jpg"
+                        pygame.image.save(self.surf, path)
+                        print(f"Saved as {path}")
+
+            self.render()
+            pygame.display.flip()
+            clock.tick(30)
+
+    def init_interactive(self) -> None:
+        pass
+
+    def render(self) -> None:
+        pass
diff --git a/speed_map_display.py b/speed_map_display.py
index ba03a14..b5d8769 100644
--- a/speed_map_display.py
+++ b/speed_map_display.py
@@ -1,3 +1,5 @@
+from typing import Optional
+
 import pygame
 
 from gps_loader import GPSLoader
@@ -23,6 +25,8 @@ class SpeedMapDisplay(MapDisplay):
         self.max_speed_col: tuple[int, int, int] = max_speed_col
         self.segment_threshold: float = segment_threshold
 
+        self._path: Optional[Path] = None
+
     def draw_path(self, path: Path) -> None:
         min_speed = min(path.extra_data)
         max_speed = max(path.extra_data)
@@ -55,6 +59,16 @@ class SpeedMapDisplay(MapDisplay):
 
         return r, g, b
 
+    def render(self) -> None:
+        self.surf.fill((0, 0, 0))
+        self.draw_cities()
+
+        if self._path is not None:
+            self.draw_path(self._path)
+
+    def set_path(self, path: Path) -> None:
+        self._path = path
+
 
 if __name__ == '__main__':
     name = "data_28-03"
@@ -78,6 +92,6 @@ if __name__ == '__main__':
         cities,
         (255, 0, 0), (0, 255, 0), 155)
 
-    display.draw_path(path)
-    pygame.display.flip()
-    input()
+    display.set_path(path)
+
+    display.mainloop()