Derek Turner, head of traffic for Transport for London and the man behind the pedestrianization of Trafalgar Square, said a large-scale secure zone around Westminster was not beyond the realms of possibility as long as buses and taxis continue to circulate. "People said a ring of steel [in the City] would be impossible. They said congestion-charging would be chaos. But traffic adapts."
He said much of the traffic on Whitehall that passed in front of Downing Street consisted of buses, taxis and official government vehicles. But he warned that it was not necessarily the wisest security measure to stop traffic flowing around high-profile targets.
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