Motorists approaching an entrance ramp along Massachusetts' well-traveled Route 128 recently were pleasantly surprised at the ease with which they could enter the expressway. Instead of the usual pile-up along the ramp, car after car moved effortlessly into the mainstream of traffic. Drivers barely glanced back to look for an opening. They did not have to. Like the flashlight of a theater usher, moving green lights at the edge of the ramp led them surely and safely up and out onto the highway.
The guidance system that performed this small miracle was developed by...
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