Adding rotation data to wapoints script

Hi, I'm using the following script to make a waypoints system. I seems to work fine apart from that it doest take the rotation of the waypoint in to account, any idea on how I add this?I would lie it to smoothly look in each waypoint's X axis direction.

Thanks

 using UnityEngine;
 using System.Collections;
  
 public class WaypointsMover : MonoBehaviour {
     public Transform[] waypoints;
     public float waypointRadius = 1.0f;
     public bool loop = true;
     public float speed = 2.0f;
  
     private Vector3 currentHeading,targetHeading;
     private int targetwaypoint;
     private Transform _transform;
  
     protected void Start () {
         enabled = false;
         _transform = transform;
         if(waypoints.Length <= 0) {
             Debug.Log("No waypoints on " + name);
             enabled = false;
         }
         targetwaypoint = 0;
     }
  
     protected void Update() {
         if(Vector3.Distance(_transform.position, waypoints[targetwaypoint].position) <= waypointRadius) {
             targetwaypoint++;
             if(targetwaypoint >= waypoints.Length) {
                 targetwaypoint = 0;
                 if(!loop)
                     enabled = false;
             }
         }
         _transform.position = Vector3.MoveTowards(_transform.position, waypoints[targetwaypoint].position, Time.deltaTime * speed);
     }
  
     // Draws red line between waypoints, and sphere with radius
     public void OnDrawGizmos() {
         if(waypoints == null)
             return;
  
         for(int i=0;i< waypoints.Length;i++) {
             Gizmos.color = new Color(0.9f, 0, 0, 0.3f);
             Gizmos.DrawSphere(waypoints[i].position, waypointRadius);
             Gizmos.color = Color.red;
             Vector3 pos = waypoints[i].position;
             if(i>0) {
                 Vector3 prev = waypoints[i-1].position;
                 Gizmos.DrawLine(prev,pos);
             }
         }
     }
 }