That only really makes sense where there's a tradeoff: with carbon taxes, you can at least understand why carbon-based energy sources are being used. With loud

That only really makes sense where there's a tradeoff: with carbon taxes, you can at least understand why carbon-based energy sources are being used. With loud cars, there's no benefit to tradeoff against! IMO, bans make more sense. That said, your proposal is better than nothing, and I would be in favor of anything that reduces the amount of noise pollution.