Â Ken Livingstone used these objects to enforce his traffic congestion plan by identifying cars via their license plates.
Daniel Hamilton is the head of an organization that opposes the proliferation of these objects. Â Much of the financing for these objects came from fundraising initiatives called City Challenge Competitions, which begun in earnest after the murder of James Bulger. Â An early group of these objects, put in place following the Bishopsgate terrorist attack, was known as the Ring of Steel, and McCahill and Norris estimated that there were over four (*) million of them in the United Kingdom. Â A scandal erupted in the 1990s after it was revealed that a group of these objects in Heathrow airport were not functional. Â Ken Livingstone used these objects to enforce his traffic congestion plan by identifying cars via their license plates. Â For 10 points, name these surveillance devices that are ubiquitous in London.
Daniel Hamilton is the head of an organization that opposes the proliferation of these objects.
video cameras [accept equivalents; accept anything referring to CCTV]