A proposal to extend the Broad Street subway line in Philadelphia is intended to attract new commercial and residential development in the city's Navy Yard. A change in construction technique is driving up the cost, however.
The Rebuild initiative in Philadelphia depends on funding generated by a 1.5 cents-an-ounce tax on sugary beverages. The tax is in effect, but $300 million in bonds have to wait for a court decision about the tax.
This report estimates that U.S. cities could save half a trillion dollars by investing in "smart surface technologies." The study takes into account obvious factors like energy use and less intuitive ones like tourism revenues.