Proper public transport - the only way forward. Trucks damage the road, so use the money that would normally be spent on road repair to subsidise rail transport. At least on the motorways, that's job done.

And add in proper bus services around town, so you don't need to drive in. Park-and-ride services are a great idea, even if they're a bit expensive (£1.20 per trip here in Cambridge). Subsidise this to halve that price, and everyone will use it.

Graham.