feat: add strips on road

src/car.py

@@ -54,6 +54,7 @@ class Car:
 
         if not self.forward and not self.backward:
             self.speed -= sign(self.speed) * self.FRICTION * dt
+            self.speed = max(0, self.speed)
 
         if abs(self.speed) < 1e-4:
             self.speed = 0