High Quality Content by WIKIPEDIA articles! The ring of steel is the popular name for the security and surveillance cordon surrounding the City of London, installed to deter the IRA and other threats.The term was borrowed from an earlier stage of the Troubles when the centre of Belfast was fortified against attacks, the perimeter of which was known as the ring of steel. Roads entering the City are narrowed and have small chicanes to force drivers to slow down and be recorded by CCTV cameras. These roads typically have a concrete median with a sentry box where police can stand guard and monitor traffic. City planners call these types of precautions "fortress urbanism". Some roads have been closed to traffic entirely.Despite the term "ring of steel", the roadblocks and chicanes are actually created with concrete blocks, sometimes plastic coated, that are wedged together.

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