HOW TO MOVE A CAR IN UNITY USING C#

using UnityEngine;

[RequireComponent(typeof(Rigidbody))]
public class ArcadeCarController : MonoBehaviour
{
    [Header("Engine & Acceleration")]
    [SerializeField] private float accelerationSpeed = 25f;
    [SerializeField] private float maxForwardSpeed = 45f;
    [SerializeField] private float reverseSpeed = 15f;
    [SerializeField] private float brakeForce = 35f;

    [Header("Steering Dynamics")]
    [SerializeField] private float turnSpeed = 90f;
    [SerializeField] private float traction = 0.9f;

    private Rigidbody rb;
    private float moveInput;
    private float steerInput;

    public float CurrentSpeedKmh => rb.linearVelocity.magnitude * 3.6f;

    private void Awake()
    {
        rb = GetComponent<Rigidbody>();
        // Lower Center of Mass to prevent flipping over during sharp corners
        rb.centerOfMass = new Vector3(0f, -0.4f, 0f);
    }

    private void Update()
    {
        // Read Player Input (WASD or Arrow Keys)
        moveInput = Input.GetAxisRaw("Vertical");
        steerInput = Input.GetAxisRaw("Horizontal");
    }

    private void FixedUpdate()
    {
        HandleAcceleration();
        HandleSteering();
        ApplyLateralFriction();
    }

    private void HandleAcceleration()
    {
        if (Mathf.Abs(moveInput) > 0.05f)
        {
            float targetSpeed = moveInput > 0 ? maxForwardSpeed : reverseSpeed;
            Vector3 forwardForce = transform.forward * (moveInput * accelerationSpeed);
            
            if (rb.linearVelocity.magnitude < targetSpeed)
            {
                rb.AddForce(forwardForce, ForceMode.Acceleration);
            }
        }
        else
        {
            // Deceleration / Natural Braking
            rb.linearVelocity = Vector3.Lerp(rb.linearVelocity, Vector3.zero, Time.fixedDeltaTime * 0.8f);
        }
    }

    private void HandleSteering()
    {
        // Steer only when moving to simulate tire grip
        float speedRatio = Mathf.Clamp01(rb.linearVelocity.magnitude / 3f);
        float direction = Vector3.Dot(transform.forward, rb.linearVelocity) >= 0 ? 1f : -1f;

        float turnAmount = steerInput * turnSpeed * speedRatio * direction * Time.fixedDeltaTime;
        Quaternion turnRotation = Quaternion.Euler(0f, turnAmount, 0f);
        rb.MoveRotation(rb.rotation * turnRotation);
    }

    private void ApplyLateralFriction()
    {
        // Cancel sideways drift based on traction ratio
        Vector3 forwardVelocity = transform.forward * Vector3.Dot(rb.linearVelocity, transform.forward);
        Vector3 lateralVelocity = transform.right * Vector3.Dot(rb.linearVelocity, transform.right);
        
        rb.linearVelocity = forwardVelocity + (lateralVelocity * (1f - traction));
    }
}