Transportation

Next time you're stuck in traffic, think about this: as smart as our cars have become, our roadways are about to get a whole lot smarter.

Building new roads and new lanes often just isn't possible any longer, but building intelligence into the roads and the cars-with roadside sensors, radio frequency tags, and global positioning systems-certainly is.

In Stockholm, a new smart toll system has reduced traffic congestion and carbon emissions by impressive percentages.