May 4, 2014
What you are proposing is not really all that nascent. There are plenty of mathematical models of traffic flow that use linear algebra to study optimizing your proposition. In the case of a great deal of municipalities, it's just a matter of these municipalities having enough staff dedicated to retool their traffic flow algorithms. Here's a good example of a deployment. http://amsterdamsmartcity.com/projects/detail/id/58/slug/smart-traffic-management
May 5, 2014
additionally as smartter cars are developed the possiblity of sel driving cars in communication with a network could automatically alter speed to benefit traffic flow.