diff --git a/map_display.py b/map_display.py
index e0495e6..ad28418 100644
--- a/map_display.py
+++ b/map_display.py
@@ -3,24 +3,32 @@ from typing import Optional
 import pygame
 
 from path import Path
+from vec import Vec2
 
 
 class MapDisplay:
     PATH_WIDTH = 5
+    SEGMENT_SIZE = 20
+    MIN_SEGMENT_LENGTH = 5
 
-    def __init__(self, surf: pygame.Surface, min_lat: float, max_lat: float, min_lon: float, max_lon: float):
+    def __init__(self,
+                 surf: pygame.Surface,
+                 min_lon: float,
+                 max_lon: float,
+                 min_lat: float,
+                 max_lat: float):
         self.surf: pygame.Surface = surf
-        self.min_lat: float = min_lat
-        self.max_lat: float = max_lat
         self.min_lon: float = min_lon
         self.max_lon: float = max_lon
+        self.min_lat: float = min_lat
+        self.max_lat: float = max_lat
 
     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)
 
         w, h = self.surf.get_size()
-        return x * w, y * h
+        return x * w, h - y * h
 
     def draw_path(self, path: Path) -> None:
         self.draw_colored_path(path, None)
@@ -34,4 +42,18 @@ class MapDisplay:
             pygame.draw.circle(self.surf, col, (x, y), self.PATH_WIDTH)
 
     def draw_segment(self, path: Path, start_i: int, end_i: int) -> None:
-        raise NotImplementedError
+        if end_i - start_i < self.MIN_SEGMENT_LENGTH:
+            return
+
+        points = []
+        for i in range(start_i, end_i):
+            pt = path.points[i]
+            pt = Vec2(*self.real_to_screen(pt.x, pt.y))
+            n = path.normals[i]
+            n = Vec2(n.x, -n.y)
+            pt1 = pt + n * self.SEGMENT_SIZE
+            pt2 = pt - n * self.SEGMENT_SIZE
+            points.insert(0, (pt1.x, pt1.y))
+            points.append((pt2.x, pt2.y))
+
+        pygame.draw.lines(self.surf, (255, 255, 255), True, points)
diff --git a/path.py b/path.py
index 54d9381..d3f9be4 100644
--- a/path.py
+++ b/path.py
@@ -9,6 +9,8 @@ class Path:
         self._init_normals()
 
     def _init_normals(self) -> None:
+        pt0 = self.points[0]
+        self.normals.append(Vec2(pt0.y, -pt0.x))
         for i in range(1, len(self.points) - 1):
             pt1 = self.points[i-1]
             pt2 = self.points[i]
@@ -22,3 +24,6 @@ class Path:
                 d = -d
 
             self.normals.append(d)
+
+        ptl = self.points[-1]
+        self.normals.append(Vec2(ptl.y, -ptl.x))
\ No newline at end of file
diff --git a/speed_map_display.py b/speed_map_display.py
index 0e3bbd0..ae4125c 100644
--- a/speed_map_display.py
+++ b/speed_map_display.py
@@ -2,25 +2,25 @@ import pygame
 
 from map_display import MapDisplay
 from path import Path
+from vec import Vec2
 
 
 class SpeedMapDisplay(MapDisplay):
     def __init__(self,
                  surf: pygame.Surface,
-                 min_lat: float,
-                 max_lat: float,
                  min_lon: float,
                  max_lon: float,
+                 min_lat: float,
+                 max_lat: float,
                  min_speed_col: tuple[int, int, int],
                  max_speed_col: tuple[int, int, int],
                  segment_threshold: float):
-        super().__init__(surf, min_lat, max_lat, min_lon, max_lon)
+        super().__init__(surf, min_lon, max_lon, min_lat, max_lat)
         self.min_speed_col: tuple[int, int, int] = min_speed_col
         self.max_speed_col: tuple[int, int, int] = max_speed_col
         self.segment_threshold: float = segment_threshold
 
     def draw_path(self, path: Path) -> None:
-        colors = []
         min_speed = min(path.extra_data)
         max_speed = max(path.extra_data)
 
@@ -28,6 +28,18 @@ class SpeedMapDisplay(MapDisplay):
 
         self.draw_colored_path(path, colors)
 
+        in_segment = False
+        start_i = 0
+        for i, speed in enumerate(path.extra_data):
+            if speed >= self.segment_threshold:
+                if not in_segment:
+                    in_segment = True
+                    start_i = i
+
+            elif in_segment:
+                in_segment = False
+                self.draw_segment(path, start_i, i)
+
     def interpolate_color(self, speed: float, min_speed: float, max_speed: float) -> tuple[int, int, int]:
         r_span = self.max_speed_col[0] - self.min_speed_col[0]
         g_span = self.max_speed_col[1] - self.min_speed_col[1]