Through the different radius of turns, they have radius' 1-4 that will work together to make a 4 lane. Then, they have a connector for adding multi-lanes..... The lady at the hobby store showed me the stuff I would need. Oh yeah, she also suggested an aftermarket transformer to keep the power equal on all the lanes. Take a look at Carrera North America's web site, they've got the goodies and links to lots more trick stuff you can do!!!! Afraid this stuff might be as addictive as crack cocaine!!~!!!!