This is a fantastic story on NPR radio in response to a $1b road widening program in Los Angeles taking the Highway 405 from 10-lanes wide to 12 lanes. Siting worldwide research done by academics in Toronto the program discusses the idea that as you increase the number of roads in a city you increase the amount of driving. Another interesting issue raised is the idea that providing public transport DOES NOT reduce the amount of driving. Only reducing the amount of road space or increasing the cost of driving will do that.
Click here to read or hear the story.