I like the idea of a big spend on electric vehicles. The government essentially buys your petro clunker and gives you a $20k tax credit toward an electric vehicle. Maybe shoot for 5 million vehicles a year for only $100 billion per year. Some of the money could come from a gas/CO2 tax.
Electric roadways aren’t mutually exclusive to a credit either. I think putting solar roofs over roadways might be interesting for energy use and keeping the roadway safer. On sensitive areas you might keep the roads from getting snow and ice buildup in the winter.
Another way to get more EVs faster is for EV tax credits to apply to conversions as well as new vehicles. Let's say you have a Honda Civic. Ideally, you'd be able to buy a kit from Honda or a 3rd party that has all the parts including battery boxes and hire your local mechanic to install it.
Right now, hardly anyone does conversions except well-motivated hobbyists because many of the parts have to be made from scratch and you have to do a lot of custom engineering per vehicle. Also the parts that are available tend to be expensive and produced in low volume.
Electric roadways aren’t mutually exclusive to a credit either. I think putting solar roofs over roadways might be interesting for energy use and keeping the roadway safer. On sensitive areas you might keep the roads from getting snow and ice buildup in the winter.