Prodigy - It's not only the Con-Zone that's a miserable failure and a fraud (motorists money thrown down an economic pit - well into the Labour Party donating Champagne Charlies at Capita Plc to be precise who run the scam).
Traffic light proliferation around the country - Traffic lights costs £10's of thousands to install. The Government have never done a single analysis in 40 years to establish if they improve safety or improve traffic flow (I know they don't improve traffic flow and I very much doubt there's any safety benefits).
Speed Cameras - Cost £1,000's and the new Digtal one's cost £25,000 a pop. They have not improved safety one iota and do not address 96% of accidents (on urban roads) and 99% of accidents (on motorways) which are nothing to do with speed. The Govt claim they've saved lives but after their introduction road deaths increased. At best the stats' are static which proves the Govt are lying through their teeth.
Road Humps - total b*ll*cks.
Bus and Car Sharing Lanes - this removes a public asset paid for by 100% of motorists and reserves it for (private) bus companies already heavily subsidised by motorists. As for the car sharing scam I saw a news report on the scam where 1 lane was rammed with rush-hour traffic and the car sharing lane was empty. The occasional 'cheeky' car driver 'took the opportunity' for this vacant, under-utilised, waisting away piece of public road he'd paid for and was stopped by a police bike to be warned or fined.
Traffic Management Systems - I've not seen a single study but if a computerised robot couldn't organise getting itself from my lounge to my kitchen to make a cup of tea and back within 2 months what chance it can improve on the human brains efficiency and intelligence at driving 23 roads to get to work and back!!!!
Take a close look at the M4 VIP bus lane scam (or any other round London or the country). 2 lanes rammed with cars because of tail-backs (probably created by a Govt motorway traffic light, speed camera or 'traffic management scheme' somewhere down the road) and 1 vacant economically wasteful red bus lane for the occasional half-empty bus full of further motorist subsidised half-fare green backpackers in a VIP lane London to Heathrow. It's a scandallous waste of a public resources.
No doubt Brown, Darling, Red Ken and other Govt a*seholes use it in their Jaguars and visiting UN VIP (Very Ignorant Prats) eco-extremists.
Not sure about the traffic light sequences being changed in London pre-Con-Zone to create congestion but it wouldn't surprise me - put a light in anywhere and congestions created anyway!