Smooth direction of car

Hi guys,
I have a problem with my car, if I press left arrow the car turn left instant, can you help me?

Code (CSharp):

1.  wheels.wheelFL.steerAngle = Mathf.Lerp(wheels.wheelFL.steerAngle, maxSteer * Input.GetAxis("Horizontal"), Time.deltaTime + 5);
2.             wheels.wheelFR.steerAngle = Mathf.Lerp(wheels.wheelFL.steerAngle, maxSteer * Input.GetAxis("Horizontal"), Time.deltaTime + 5);

 

Remove the +5 after Time.deltaTime on both lines.

If you need the slewing to be faster or slower, you can MULTIPLY the Time.deltaTime by a value, but for now leaving it alone should give you a baseline.