Object moving between waypoints is jerky

Hi, I'm moving an object between 3 waypoints, but the movement is jerky. Is there a better way to do achive this? My code is below:

 #pragma strict
 
 public var target1 : GameObject;
 public var target2 : GameObject;
 public var target3 : GameObject;
 
 public var moveSpeed = 5.0;
 public var rotateSpeed = 6.0;
 public var distanceToTarget : float;
 public var currentTargetNum : int = 1;
 
 private var currentTarget : GameObject;
 
 function Start () {
     currentTarget = target1;
 }
 
 function Update () {
 
         distanceToTarget = Vector3.Distance(currentTarget.transform.position, transform.position);
         
         if(distanceToTarget > 2)
         {
             //--move and rotate towards target
             var rotation = Quaternion.LookRotation(currentTarget.transform.position - transform.position);
             transform.rotation = Quaternion.Slerp(transform.rotation, rotation, Time.deltaTime * rotateSpeed);
             transform.Translate(Vector3.forward * moveSpeed * Time.deltaTime);
         }else {
             //--switch to next target
             currentTargetNum++;
             if(currentTargetNum>3){
                 currentTargetNum = 1;
             }
             
             if(currentTargetNum == 1){
                 currentTarget = target1;
             }else if(currentTargetNum == 2){
                 currentTarget = target2;
             }else if (currentTargetNum == 3){
                 currentTarget = target3;
             }
             
         }
     }
  

I also want at a certain point to disable this movement and allow the object to drift for about a second to a gradual stop, but right now it stops dead. Shoudl I be using some physics to move it like AddForce instead of Translate?