I reckon price rise / scarcity would help a lot.
The roads were so much nicerer and quieter when we had those fuel shortages however many (eight?) years back.
People suddenly found ways to reduce the number of journeys, or combine them
- that was my experience, living in the country where there's not much public transport at all.
Increase the availability of public transport, lower the cost, and make it more bike friendly with carriers.
Electric cars for the Incapacitated, and small electric trucks for local deliveries.
Oh and I'll need a small tractor that runs on hydrogen fuel cells too, please, if our young inventor op has any time to spare..
I've already invented the Record player stylus, attached to the 'keep your distance' sticky out thingy.
You can have that one for free, in return for the hydrogen powered tractor and loader