Mayor Bloomberg should hold a contest for automakers to design a Hybrid Taxi. Then force all taxi operators to convert. Sell the old cabs off to other cities that aren't as gridlocked.
Think of how much quieter and cleaner the city would be, and how much gas would be saved. Then they should disable the horns.
Yes, NYC taxis would be the ideal use.
If it saves money then the operators will convert with out any government coercion. If it doesn’t then the government should stay out until the market provides a reason to convert.