So you’ve got your basic road system working and want to add a little more realism. How about working traffic lights that not only work, but are obeyed by traffic? There’s no smoke and mirrors, simply a small lead switch mounted inside the car, van or lorry that is switched by an electromagnet mounted under the baseboard just before the traffic lights. The magnets and traffic lights are connected to an electronics unit that controls those components and has adjustable time delays on the lights sequence.