Can I make my car move forward only and without inputs?

So the game that I am working on is basically just a car moving forward indefinitely and dodging obstacles. This is my current code, the car does automatically move forward without any inputs but is there anyway I can modify my current code to disable my ‘s’ or down arrow key?

    horizontalInput = Input.GetAxis("Horizontal");
    forwardInput = Mathf.Min(Input.GetAxis("Vertical") * 2 + 1 , 1);

    // Move the vehicle forward
    transform.Translate(Vector3.forward * Time.deltaTime * speed * forwardInput); 

    transform.Rotate(Vector3.up, Time.deltaTime * turnSpeed * horizontalInput);

Instead of ‘Input.GetAxis(“Vertical”)’, you could use ‘Mathf.Clamp(Input.GetAxis(“Vertical”), 0, 1)’

Then it cannot go under 0.

or u write ‘Mathf.Clamp(Input.GetAxis(“Vertical”), 0.5, 1)’

Then it will go with half speed and will go full speed when arrowUp