How do you get the Traffic lights to work. There are all on red light
You have to click the 'parent to' button in the editor and then select which junction you'd like them to control.
Once you've done that to each traffic light at the junction you can then go round each one and tell it (with the option button) whether its controlling the main road or the side road.
When you click 'option', there's a pop-up box you put a number into. 0 is usually main road, 1 side road and 2 pedestrians but it differs depending on which junction you're using.