waypoint car is skidding off the road,Waypoint car from standard asset is skidding off the road.

The waypoint car from the standard asset is skidding off the road after i wrote that script to guide the car .. Please need help

using System.Collections; using System.Collections.Generic; using UnityEngine;

public class Dreamcar01Track : MonoBehaviour {

 public GameObject TheMarker;
 public GameObject Mark01;
 public GameObject Mark02;
 public GameObject Mark03;
 public GameObject Mark04;
 public GameObject Mark05;
 public GameObject Mark06;
 public GameObject Mark07;
 public GameObject Mark08;
 public GameObject Mark09;
 public int MarkTracker;

 void Update () {

     if (MarkTracker == 0) {
         TheMarker.transform.position = Mark01.transform.position; 
     }

     if (MarkTracker == 1) {
         TheMarker.transform.position = Mark02.transform.position; 
     }

     if (MarkTracker == 2) {
         TheMarker.transform.position = Mark03.transform.position; 
     }

     if (MarkTracker == 3) {
         TheMarker.transform.position = Mark04.transform.position; 
     }

     if (MarkTracker == 4) {
         TheMarker.transform.position = Mark05.transform.position; 
     }

     if (MarkTracker == 5) {
         TheMarker.transform.position = Mark06.transform.position; 
     }

     if (MarkTracker == 6) {
         TheMarker.transform.position = Mark07.transform.position; 
     }

     if (MarkTracker == 7) {
         TheMarker.transform.position = Mark08.transform.position; 
     }

     if (MarkTracker == 8) {
         TheMarker.transform.position = Mark09.transform.position; 
     }
         

 }

 IEnumerator OnTriggerEnter(Collider collision) {
     
     if (collision.gameObject.tag == "Dreamcar01") {
         this.GetComponent<BoxCollider> ().enabled = false;
         MarkTracker += 1;
         if (MarkTracker == 9) {
             MarkTracker = 0;
         }
         yield return new WaitForSeconds (1);
         this.GetComponent<BoxCollider> ().enabled = true;

     }

 }

} ,Am trying to develop a car racing game for my project at school, the car waypoint from the standard asset is skidding off the road after i wrote this waypoint script to guide the car... i need help to allow the car follow the waypoint track.

using System.Collections; using System.Collections.Generic; using UnityEngine;

public class Dreamcar01Track : MonoBehaviour {

 public GameObject TheMarker;
 public GameObject Mark01;
 public GameObject Mark02;
 public GameObject Mark03;
 public GameObject Mark04;
 public GameObject Mark05;
 public GameObject Mark06;
 public GameObject Mark07;
 public GameObject Mark08;
 public GameObject Mark09;
 public int MarkTracker;

 void Update () {

     if (MarkTracker == 0) {
         TheMarker.transform.position = Mark01.transform.position; 
     }

     if (MarkTracker == 1) {
         TheMarker.transform.position = Mark02.transform.position; 
     }

     if (MarkTracker == 2) {
         TheMarker.transform.position = Mark03.transform.position; 
     }

     if (MarkTracker == 3) {
         TheMarker.transform.position = Mark04.transform.position; 
     }

     if (MarkTracker == 4) {
         TheMarker.transform.position = Mark05.transform.position; 
     }

     if (MarkTracker == 5) {
         TheMarker.transform.position = Mark06.transform.position; 
     }

     if (MarkTracker == 6) {
         TheMarker.transform.position = Mark07.transform.position; 
     }

     if (MarkTracker == 7) {
         TheMarker.transform.position = Mark08.transform.position; 
     }

     if (MarkTracker == 8) {
         TheMarker.transform.position = Mark09.transform.position; 
     }
         

 }

 IEnumerator OnTriggerEnter(Collider collision) {
     
     if (collision.gameObject.tag == "Dreamcar01") {
         this.GetComponent<BoxCollider> ().enabled = false;
         MarkTracker += 1;
         if (MarkTracker == 9) {
             MarkTracker = 0;
         }
         yield return new WaitForSeconds (1);
         this.GetComponent<BoxCollider> ().enabled = true;

     }

 }

}