The fight is on in the streets of London between two rival manufacturers of the iconic London black cab. Both companies are racing to create scale and secure market share of London’s black taxi fleet. The 24,000 diesel-powered black taxi fleet accounts for almost one-fifth of the city’s vehicle nitrogen oxide emissions, the Financial Times reports. All London black cabs must be capable of wheelchair access and have a turning circle of just 24 feet. The competition between LEVC, Metrocab and other challengers (such as Nissan) can only spur innovation and help drive down costs.