IA vehicle: trajectory according to path of MAYA + index

Hello I use a script to move my vehicles. To do the route, I have to make this one stage by stage. I created the path by adding manually marks. These are tags in a way, when we begin the game, the vehicle follows the route.

In the script below, I have to give the "nomChemin" Then vehicle follows the way: "void NextIndex"

Can you modify the script so that the vehicle follows the path of MAYA and begins in the IndexDeDepartVehicule (index for start of vehicule)?

Thank you

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 
 public class CarScript : MonoBehaviour {
     
     public string nomChemin;
     public float vitesseKmh;
     float vitesse;
     float sp;
     
     List <Transform> chemin;
     float range = 0.5f,ratio;
     Transform _transform,rayPoint;
     int index;
     bool stopCar,emergencyStop,noStopZone;
     Rigidbody _rigidbody;
     float acceleration;
     int layerVehicule = 1 << 8;
     
     void Start(){
         _rigidbody = rigidbody;
         _rigidbody.centerOfMass += new Vector3(0f, 0f, 1.0f);
         vitesse = vitesseKmh/3.6f;
         sp = vitesse;
         acceleration = 10;
         rayPoint = transform.Find ("RaycastPoint");
         _transform = transform;
         ControlScript sc =GameObject.Find("Controle").GetComponent<ControlScript>();
         chemin = new List<Transform> (sc.GetPath(nomChemin));
         ratio = 0;
         stopCar = emergencyStop=noStopZone = false;
         layerVehicule= ~layerVehicule;
     }
 
 void Update()
     {
         RaycastHit hit;
         float distance = 5.0f;
 
         if(!stopCar){
             if(vitesse<sp)vitesse+=Time.deltaTime*acceleration;   
             else if (vitesse > sp)vitesse -=Time.deltaTime*acceleration;
         }else if(stopCar){
             if(vitesse>0)
                 vitesse -= Time.deltaTime*acceleration;
             else 
                 vitesse=0;
         }
         if(Physics.Raycast(rayPoint.position,_transform.forward,out hit,distance)){
             vitesse = (sp * (hit.distance/distance));
         }
         Vector3 dir = _transform.position - chemin[index].position;
         if (dir.sqrMagnitude > range)
             {
                 Move(chemin[index].position);
             }
         else NextIndex();
     }
     void Move(Vector3 target)
     {
        _transform.Translate(0,0,Time.deltaTime*vitesse);
         if(ratio<1){
             ratio += Time.deltaTime*0.1f;
             var newRotation = Quaternion.LookRotation(target - _transform.position);
             _transform.rotation = Quaternion.Lerp(_transform.rotation,newRotation,ratio);
         }
     }
  
     /*void NextIndex()
     {
         if (++index == chemin.Count) index = 0;
         ratio = 0;
     }*/
     
     void NextIndex()
     {
    if (++index >= chemin.Count) {
       index = 0;
       transform.position = chemin[index].position;
    }else{
           if (++index == chemin.Count) index = 0;
             ratio = 0;
  }
   }
 
     public void StopCar(bool b){
         if(!noStopZone)
             stopCar = b;
     }
     public void SetSpeed(float f){
         sp = f;
     }
     public float GetSpeed(){
         return _rigidbody.velocity.magnitude;
     }
     public void EmergencyStop(){
         if(emergencyStop){
                 stopCar = true;
                 acceleration = 20.0f;
                 StartCoroutine (SetAcceleration());
         }
     }
     IEnumerator SetAcceleration(){
         if(vitesse != 0)yield return null;
         acceleration = 10.0f;
         emergencyStop = false;
     }
     public void SetEmergencyStop(bool b){
         emergencyStop = b;
     }
     public void SetNoStop(bool b){
         noStopZone = b;
     }
     public void Reset(){
         stopCar = false;
         noStopZone=false;
         emergencyStop= false;
     }
 }