Arduino traffic light system

1. The four (4) Arduino are connected with each other, exchanging information when each light is on/off. This means that the output of the one is an input for one or more of the rest.
2. Implement all traffic lights you consider necessary. This includes as many lights as you wish for the pedestrians.
3. Pay attention to the arrows. Road B only goes straight, north and south, does not turn left. The West side of Road A does not turn left.
4. Right turn is allowed, but then the pedestrian light has to be orange-blinking.
5. The LCD screens show the remaining seconds for the light to turn (Both green/red)
6. There is a buzzer on each one of the Arduinos, responsible for one pedestrian lane each, for the deaf people to hear. The sound starts beeping slowly when green light is on, and gets faster when the green light is about to finish.
7. Make sure that your code has proper comments.
8. Feel free to change the positions of the traffic lights. If you know how to use Microsoft Visio, you can alter the picture as you wish.