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I understand Trafficmaster use a similar system to establish average traffic-flow rates and identify traffic-jams, slow-moving traffic and other effects automatically, to feed into their paid-for travel-information service (can be used to augment sat-nav to avoid heavy traffic etc using real-time information). They have (commonly dark-blue painted) cameras on major trunk roads and motorways.Trafficmaster have been in this business in the UK for over 12 years in the UK.
How do we feel about speed restrictions, anyway? Personally, I don't find it's the speed restriction that is the major contributor in restricting my average speed; it's all the rest of you, getting in the way. (And the old dears who want to do 40mph when they could do 60.)