Look Behind Me While Still Moving Forward

I am trying to automatically run forward while being able to simultaneously look behind me (using input) however the problem I encounter is that when I press the button to look behind me my character starts running in that direction. I want the user to look behind them while still running forward. Please help.

This is the code to run forward

using UnityEngine; using System.Collections;

public class Run_Forward : MonoBehaviour {

 // Use this for initialization
 void Start () {
 
 }
 
 // Update is called once per frame
 void Update () {
 
     if (Input.GetKeyDown(KeyCode.A))
         transform.position += Vector3.right*4;
     
     if (Input.GetKeyDown(KeyCode.D))
         transform.position += Vector3.left*4;
     
     transform.Translate(0, 0, .2f);
     
 }

}

And this is the code to turn around

using UnityEngine; using System.Collections;

public class Rotate : MonoBehaviour { public Transform target;

 // Use this for initialization
 void Start () {
 
 }
 
 // Update is called once per frame
 void Update () {
     if (Input.GetKeyDown(KeyCode.T))
         transform.LookAt(target);
 }

}