Ban personal motor vehicles from city centres, with exemptions for unavoidable business trips, the disabled...
But no overtaking of cyclists unless on a dual carriageway, and the cyclist is in the left lane.
Join the urban centre areas to suburbs by high quality, segregated paths. There's still going to be goods traffic in electric vans. No HGVs in the shared spaces, cargo must be offloaded into safer vehicles for last mile delivery (ideally cargo bikes).
A high quality rail network for fast intercity travel, with cycle capacity predicated on 50%+ of passengers bringing cycles. Have cycle racks on the buses, too.
Out of town goods logistic hubs connected to the rail network, and the road network. Integrate these with Park&Ride and Park&Cycle facilities. Make inter-town bus services stop here, with connections to the local bus network. But rail can take you into the city centre with your bike.
Take a lane off the motorways to build intercity cycle roads (well barrier-ed), predicated on the level of goods traffic during lockdown being less reduced than personal vehicles, and the absolutely clear motorways.
That would be my personal utopia.
The queen can still drive from Balmoral to her local Lidl. Rural driving isn't going to be eliminated. But introduce stiff penalties for dangerous driving around cyclists, an automatic 6 month ban to start for example. If you hit a cyclist due to dangerous driving, automatic life ban. And causing death gets you a mandatory prison sentence.