A prototype of a hydrogen fuel cell cab was recently unveiled at City Hall in London. A fleet of such hybrid taxis will hit London roads by 2012 to showcase the environmentally friendly technology in time for the 2012 Olympics. The project is a part of the effort to make London free of tailpipe emissions by 2020.
The hydrogen fuel cell cab emits only water instead of diesel fumes. The cab has a top speed of 80 mph with a range of 250 miles, and is capable of recharging in only five minutes.