Cube with colliders ignores other colliders, why?

I am building a game where there is a cube (the player)who needs to get through gates on a track. I wrote a motor script and now the colliders don't work. Why? I can not for the life of me figure this out. I think it has something to do with the script.

 using UnityEngine;
 using System.Collections;
 
 public class testMotor
 : MonoBehaviour {
 public float MoveSpeed = 10;
 public float RotateSpeed = 40;
  
 void Start()
 {
 }
 // Update is called once per frame
  
 void Update () 
 {
     // Amount to Move
     float MoveForward = MoveSpeed * Time.deltaTime;
     float MoveSide = Input.GetAxis("Horizontal") * MoveSpeed * Time.deltaTime; 
  
  
     // Move the player
     transform.Translate(Vector3.forward * MoveForward);
     transform.Translate(Vector3.right * MoveSide);
  
 }
 }

also the cube is the parent with the script, a mesh renderer and a mesh collider. It has 2 child objects: a camera and a spotlight. The walls are just planes with mesh renderers and colliders on them.

thank you