Part of the issue with stuff backing up at the ports is due to the fact that CA has already put into effect a law that states big rig tractors cannot be more than 10 or 15 years of age (I forget the exact life they allow) and after that time they must be replaced. Along with that, they put into effect a law that ICE trucks cannot be used or sold in the state after I think 2030. So no trucking company wants to buy new tractors because they will have to turn them over soon, and there are not the electric or hydrogen alternatives available in quantity at this time, so there are not enough trucks. Add to that the fact that the unions managed to get through a law that independent operators are not allowed at the ports, only unionized drivers from large trucking companies and you can see why stuff is piling up at the ports in CA. So, yes they are already banning existing technology.
The registration ban for older diesels is part of CARB's "Truck and Bus Regulation":
Truck and Bus Regulation | California Air Resources Board

They're now implementing the final phase, but all of this was written and enacted in 2008. The regulation basically states that diesel trucks must have working 2010 model year (or newer) emissions hardware in place (DPF and DEF/SCR systems). Any business owner has had over a decade to prepare for this final phase out of older diesels. It's not a rolling time frame, where 10 year old trucks will continue to be banned each year or anything. It's just that they're not going to register diesel trucks with unregulated emissions. The regulation does allow for older trucks to be registered if it can be proven that they're compliant with MY2010 regulations, and there is some financial assistance for qualifying businesses to upgrade.
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