NullReferenceException in Two Scripts

I Got NullReferenceException when trying to access variable from another script, also if someone could advise me in improving the code would be great. Any help appreciated.

The script im tryin accessing from: (Accessed variable is set as public float vechiclespeed)

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class MoveCars : MonoBehaviour
 {
 
 
     public float vechiclespeed;
     private bool stopped = false;
     private float stoptime;
 
 
     // Use this for initialization
     void Start()
     {
         stopped = false;
         vechiclespeed = 10;
     }
 
     void CarMoves()
     {
         transform.Translate(Vector3.forward * vechiclespeed * Time.deltaTime);
     }
 
     void CarStops()
     {
         stopped = true;
         stoptime = 1;
         //Debug.Log("Hamuje");
     }
 
     // Update is called once per frame
     void Update()
     {
         if (stopped == false)
             {
             CarMoves();
             }
                               
         if (stoptime > 0)
             {
             stoptime = stoptime - 1 * Time.deltaTime; //Debug.Log(stoptime);
             }
 
         //if (vechiclespeed > 0) { vechiclespeed = vechiclespeed - 1; }
         // transform.Translate(Vector3.forward * vechiclespeed * Time.deltaTime);
         if (stoptime == 0)
             {
             stopped = false;
             }
     }
 
                   
     
 
     void OnTriggerEnter(Collider other)
     {
         CarStops();
     }
 
     /*
     void OnTriggerStay(Collider other)
     {
         CarStops();
         //Debug.Log("Stoi");
     }
     */
 
     void OnTriggerExit(Collider other)
     {
         stopped = false;
         stoptime = 0;
         //Debug.Log("Rusza");
     }
 
 
 
 }
     

And the script in which im tryin to change accessed value (anotherscript.vechiclespeed in Void SpawnVechicles with no success):

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class SpawnThemAll : MonoBehaviour {
 
     public Transform[] SpawnPoints;//liczba punktow tworzenia
     public float spawntime = 1f;
     public float repeattime = 2f;
     private float vechiclesnumber;
     public float vechicles_max;
     public GameObject[] Vechicles;
 
     private float timepassed;
 
     private string Debug_timepassed;
     private string Debug_vechiclesnumber;
     private string Debug_vechicles_max;
     private Vector3 spawnpointvector;
 
     private MoveCars anotherscript;
 
         // Use this for initialization
 
     void Awake ()
     {
         anotherscript = GetComponent<MoveCars>();
     }
     void Start ()
     {
         InvokeRepeating("SpawnVechicles", spawntime, repeattime);
     }
 
     void Debug_Update ()
     {
         Debug_timepassed = timepassed.ToString();
         Debug_vechiclesnumber = vechiclesnumber.ToString();
         Debug_vechicles_max = vechicles_max.ToString();
     }
     
     // Update is called once per frame
     void Update () {
         
         Debug_Update();
         timepassed = timepassed + 1 * Time.deltaTime;
 
     }
 
     void CountVechicles ()
     {
         GameObject[] thingyToFind = GameObject.FindGameObjectsWithTag("Vechicle");
         vechiclesnumber = thingyToFind.Length;
     }
 
     void SpawnVechicles ()
     {             
            
         int SpawnIndex = Random.Range(0, SpawnPoints.Length);
         int Vechicleindex = Random.Range(0, Vechicles.Length);
 
         CountVechicles();
 
         if (vechiclesnumber < vechicles_max)
         {
             spawnpointvector = SpawnPoints[SpawnIndex].position;
             var hitColliders = Physics.OverlapSphere(spawnpointvector, 0);
             if (hitColliders.Length > 0)
             {
                 Debug.Log("SpawnPoint Occupied");               
             }
             else
             {
                 Instantiate(Vechicles[Vechicleindex], SpawnPoints[SpawnIndex].position, SpawnPoints[SpawnIndex].rotation);
 
     
                 anotherscript = GetComponent<MoveCars>();
                 anotherscript.vechiclespeed = Random.Range(0,10);             
 
 
                 Debug.Log("Spawned new vechicle " + vechiclesnumber);
                 CountVechicles();
 
                 // Camera.main.transform.position = 
                 //  new Vector3(SpawnPoints[SpawnIndex].position.x+5, SpawnPoints[SpawnIndex].position.y+5, SpawnPoints[SpawnIndex].position.z-5);
 
                 //Camera.main.transform.LookAt(SpawnPoints[SpawnIndex].position);
             }
 
 
         }
 
     }
 
     void OnGUI()
     {
 
         GUI.Box(new Rect(10, 10, 200, 20), "Time Passed: "+Debug_timepassed);
         GUI.Box(new Rect(10, 30, 200, 20), "Vechicles: "+Debug_vechiclesnumber+" / Max: "+Debug_vechicles_max);
     }
 
 
 }