I don't really understand why motorways and A roads (or other roads without pedestrians) need streetlights. Surely headlights should be sufficient. You could even have streetlights automatically turn on in the event of a breakdown or crash, which could even conceivably improve safety as it would be a very visible warning of an impending hazard.

Ticket barriers feel just a few years away from being defunct, with contactless charging. You could even add the ambient readers on the train doors...

This is further off, but train notice boards may become unnecessary with our personal device giving all relevant information and directing us to the relevant platform, which would in turn reduce the need for main concourses - just wait in the local pub turn you device to tell you to go straight to the platform.