Traffic control is increasingly being viewed as one essential element of a wider ‘system of systems’ – the smart city. Jason Barnes, Jon Masters and David Crawford report on latest ideas and efforts for making cities ‘smarter’ Virtually every element of the fabric and utilitarian operations that make urban areas tick can now be found somewhere in the mix that is the ‘smart city’ agenda. Ideas have expanded and projects pursued in different directions as the rhetoric on making cities ‘smarter’ has grown. App