Inheritance using base()

//In Vehicle.cs file
using System;

namespace LearnInheritance
{
  class Vehicle
  {
    public Vehicle (double speed){
      this.Speed = speed;
      LicensePlate = Tools.GenerateLicensePlate();
    }

    public string LicensePlate
    { get; private set; }   //Since the LicensePlate and Speed properties defined in Vehicle are no longer accessed in Sedan or Truck, they no longer need to be protected. Switch those two setters to private.

    public double Speed
    { get; private set; }

    public int Wheels
    { get; protected set; }

    public void SpeedUp()
    {
      Speed += 5;
    }

    public void SlowDown()
    {
      Speed -= 5;
    }

    public void Honk()
    {
      Console.WriteLine("HONK!");
    }

  }
}
============================================================================================================================
//In Sedan.cs file
using System;

namespace LearnInheritance
{
  class Sedan : Vehicle, IAutomobile
  {
    public Sedan(double speed) :base(speed)  //inherit parent constructor with the same one argument - speed
    {
     //hence no need set values for Speed and LicensePlate here
      Wheels = 4;
    }
  }
}
============================================================================================================================
//In Truck.cs file
using System;

namespace LearnInheritance
{
  class Truck : Vehicle, IAutomobile
  {
    public double Weight
    { get; }

    public Truck(double speed, double weight): base(speed) //also inherit parent constructor
    {
      //also no need set values for Speed and LicensePlate here
      Weight = weight;

      if (weight < 400)
      {
        Wheels = 8;
      }
      else
      {
        Wheels = 12;
      }
    }

  }
}