What About the Worms?

My three children always worry about the worms which get paved over when someone paves a driveway. I worry about the absence of ground for absorbing rain, and removing that much more grass from suburbia. I'm intrigued about GrassPave(2) which is a system in the ground over which grass is planted. The grass can then be driven over. I'd love to know how it would hold up in a Pittsburgh winter, and what I would do when I need to remove snow -- can I shovel it? Or use a snow blower?