As Shalini searched the internet for scripts, I decided to write the scripts for the movement of the car.

This is a basic layout:

using UnityEngine;

using System.Collections;

public class CarControls : MonoBehaviour

{

    #region Variables

    public float playerSpeed = 100;

    #endregion

    #region Update

    //Update per frame

    void Update()

    {

        // grab the left and right arrow key to move

        float horMov = Input.GetAxis("Horizontal") * playerSpeed * Time.deltaTime;

float verMov = Input.GetAxis("Vertical") * playerSpeed * Time.deltaTime;

        transform.position = new Vector3(this.transform.position.x +  horMov, 

                                               this.transform.position.y + verMov ,

                                               0);

    }

    #endregion

}