For proof of London cabbies' devotion to their beloved black cabs, look no further than one unidentified driver's tattooed forearm. Photographed during a taxi drivers' 90-minute protest in central London on 10 February, the driver was one of some 8,000 cabbies who stopped traffic in this part of the city to protest Transport for London's acceptance of US-based on-demand ride service Uber, along with the agency's decision to ease rules related to passenger pickup — rules designed to increase rider safety, says Unite, the taxi driver's union. Cabbies also complain that an influx of Uber vehicles has heightened congestion in London and increased pollution.