If you build it, they will drive it...

...not really. As this column in JS Online states "roads fill up when they go where needed":

"While a region's transportation is important to businesses, people choose communities in a region because of factors such as taxes, schools or available houses. Freeways may shuffle some growth toward this suburb rather than that, but lacking a freeway doesn't make people into new urbanists.

'We design our personal network' - our trips to work or the grocery store - 'not around the highway network but around our lives,' he says."

The demonizing of freeways, by some on the left, as the reason people flock to the suburbs is debunked. People choose to live where they live for many, many reasons. One of the lowest priorities is whether a freeway runs through it!