There are lots and lots of ideas on beyond about how to curb traffic, its something everyone has an opinion about. Build more lanes, teach people how to drive etc, the thing is all these are just opinions with no evidence that they will work.
Here is a nice simple and interesting read on why building bigger roads will not work backed by real research. In fact they go on to say expanding public transit doesn't even help congestion which is hard to believe. It also comes with a suggestion to solve congestion:
http://www.wired.com/2014/06/wuwt-tr...nduced-demand/