My megaproject ideas are mostly pretty standard. I'd build a high speed rail network across North America, and build and expand metro and regional rail systems in and around every city. I'd turn all cities and suburbs into fifteen-minute cities. I'd decommodify housing, and build ten million units of public/social/non-market housing, mostly three bedroom units. I'd link those last three policies together by building TODs around the new Metro and rail stops. And I'd build bicycle networks in every town and city and connect them to the TODs. I'd build bridges and walkways across skyscrapers. I'd put a bidet in every American toilet (uses less water than toilet paper apart from being more comfortable). Fiber internet in every home. A heat pump in every home. An induction stove in every kitchen. Phase out fossil fuels and power everything with Pumped Storage Hydropower and Geothermal. I'd make the US go Metric.
But my truly crazy, obsessive idea would be to bring back the French Revolutionary calendar. Or I'd purge all French influences from English.
Ban lawns. Like, completely. No more lawns. Having one is a punishable offense. I want children to report their parents on this matter. Merciless enforcement. EVERYONE with ground space MUST have a garden.
One of my not-crank i will actually do this if you fools let me wield power projects is evacuating the suburbs in to high density city cores, mining the burbs for useful materials, the bulldozing them for use as crop lands, light industry, and whatever else is acceptable to have near cities.