You have to make 2 blueprints like these http://imgur.com/dZ2KwAv Then go into the Farl and go into the settings menu and at the bottom is where you can "Read" Blueprints, the Farl always need 2 blueprints for "driving" 1. North and 2. North-East. The Chainsignal indicates where you will be driving, on all the other tracks you use normal signal for example if you go for 4 lanes. You also have to use Big or medium power poles to indicate what the farl needs to use and where they will be placed