Obama "vowing to find new ways to stimulate" economy

This is a new way to stimulate the economy? If the expenditures makes sense, fine. But presumably any project that could have had any possible justification has already been funded.

Vowing to find new ways to stimulate the sputtering economy, President Barack Obama will call for long-term investments in the nation's roads, railways and runways that would cost at least $50 billion.
The infrastructure investments are one part of a package of targeted proposals the White House is expected to announce in hopes of jump-starting the economy ahead of the November election. Obama will outline the infrastructure proposal Monday at a Labor Day event in Milwaukee.
While the proposal calls for investments over six years, the White House said spending would be front-loaded with an initial $50 billion to help create jobs in the near future.
The goals of the infrastructure plan include: rebuilding 150,000 miles of roads; constructing and maintaining 4,000 miles of railways, enough to go coast-to-coast; and rehabilitating or reconstructing 150 miles of airport runways, while also installing a new air navigation system designed to reduce travel times and delays. . . .