I live in Northampton and my folks near nottingham. For most of the past 5 years the M1 from j16 to the M6 has been 50mph and narrow lanes due to smart motorway improvements. It was reopened in nov 17 and the benefit for all those years of disruption .... signs that tell us to take a break or dont drink and drive and the loss of the hard shoulder.
Sadly government has a history of mis managing technology projects. By the time these smarts roads are completed the technology will be obsolete.
My sat nav provides more accurate, more specific and relavent info to me than any smart network can currently.
20 plus years ago traffic master installed sensors on virtually all motorways in just a few years which provided real time traffic data which they sold to major car manufacturers. Demonstration that viable commercial projects can deliver much more effeciently than governments.
If government is to focus on tech then they should consult tom tom , google etc and focus on data collection and provision of that data to commercial business who are much better placed to distribute it via apps or products that end users have confidence in. After all the next generation of vehicles will have the tech to display all the info we need, so why waste money on electronic signs on motorways when the vehicles can already display it?