Montgomery County, Md., where I live, just announced that more children were going to have to walk to school next year to save money on bus fuel.

Altair Product Design recently unveiled what it says is the world's first series hydraulic hybrid transit bus and says it delivers twice the fuel economy of a conventional diesel bus.

The bus Train, a dual-mode vehicle that has the versatility of a bus, the speed of light rail and fuel economy vastly better than either.