did a minor tweak

Assets/Scripts/CarScript.cs

@@ -0,0 +1,40 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class CarScript : MonoBehaviour {
+    public float speed = 3f;
+    
+    private Rigidbody2D rb;
+    public Vector2 startPositionRelativeToTransform;
+    public Vector2 endPositionRelativeToTransform;
+
+    private Vector2 absStartPosition, absEndPosition;
+
+    void Start() {
+        rb = this.GetComponent<Rigidbody2D>();
+        absStartPosition = startPositionRelativeToTransform + rb.position;
+        absEndPosition = endPositionRelativeToTransform + rb.position;
+    }
+
+    void FixedUpdate() {
+        if (Movement.pause) return;
+        // Calculate distance to end
+        Vector2 distanceToFinish = absEndPosition - rb.position;
+
+        if (distanceToFinish.magnitude < 1) {
+            // If we're close enough to the end, reverse direction
+            Vector2 temp = absStartPosition;
+            absStartPosition = absEndPosition;
+            absEndPosition = temp;
+            transform.localScale = new Vector3(-transform.localScale.x, 1, 1);
+        }
+
+        Vector2 direction = absEndPosition - rb.position;
+
+        moveMe(direction.normalized);
+    }
+    void moveMe(Vector2 direction) {
+        rb.MovePosition(rb.position + direction * speed * Time.fixedDeltaTime);
+    }
+}