OOP real time example - Traffic Signal

public abstract class TrafficLight
 { 
    public bool IsTrafficAllowed { get; protected set;} 
    public abstract void AllowTraffic(); 
    public abstract void BlockTraffic(); 
} 
public class CarsTrafficLight : TrafficLight  
{   
    public bool IsGreenLightOn {get; private set;}
    public bool IsOrangeLightOn {get; private set;} 
    public bool IsRedLightOn {get; private set;}
    public override void AllowTraffic() 
{   
    IsGreenLightOn = true;
    IsOrangeLightOn = false; 
    IsRedLightOn = false;
    base.IsTrafficAllowed = true; 
}   
public override void BlockTraffic()
{
    IsOrangeLightOn = true; 
    Thread.Sleep(1000); 
    IsGreenLightOn = false;
    IsRedLightOn = true base.IsTrafficAllowed = false; 
} 
}  
public class PedestriansTrafficLight : TrafficLight 
{
 //Does not have orange light, and a sound is played in some countries 
}