early binding + reference array C#

Program.cs

class Transport
{
    public void Drive()
    {
        Console.WriteLine("Transport::Drive()");
    }
}

class Car : Transport
{
    public new void Drive()
    {
        Console.WriteLine("Car::Drive()");
    }
}

class Bike : Transport
{
    public new void Drive()
    {
        Console.WriteLine("Bike::Drive()");
    }
}

class Tram : Transport
{
    public new void Drive()
    {
        Console.WriteLine("Tram::Drive()");
    }
}

class Program
{
    static Transport GetSomeTransport()
    {
        var rand = new Random();
        int r = rand.Next(3);
        if (r == 0) return new Car();
        if (r == 1) return new Tram();
        return new Bike();
    }

    static void Main()
    {
        int count = 5;
        // count = int.Parse(Console.ReadLine());
        // Random rand = new Random();
        // count = rand.Next(20);

        Transport[] traffic = new Transport[count];

        traffic[0] = new Car();
        traffic[1] = new Car();
        traffic[2] = new Bike();
        traffic[3] = new Tram(); 
        traffic[4] = GetSomeTransport();

        ///////////////////////// чекаємо смарагдовий колір на світлофорі...
        Console.BackgroundColor = ConsoleColor.Black;
        Console.ForegroundColor = ConsoleColor.Red;
        Console.Clear();
        Console.Write("Wait 3 ");
        Thread.Sleep(1000);
        Console.Write("2 ");
        Thread.Sleep(1000);
        Console.Write("1 ");
        Thread.Sleep(1000);
        Console.Clear();
        Console.BackgroundColor = ConsoleColor.Black;
        Console.ForegroundColor = ConsoleColor.Green;
        Console.WriteLine("Go!!!");
        Console.WriteLine();
        Thread.Sleep(1000);
        Console.BackgroundColor = ConsoleColor.Black;
        Console.ForegroundColor = ConsoleColor.Gray;
        Console.Clear();

        for (int i = 0; i < count; i++)
            traffic[i].Drive();
    }
}