![A brave but confident cleaning contractor abseils from 20 Fenchurch Street aka the Walkie Talkie building in the capital's oldest financial district aka The Square Mile](https://s.wsj.net/public/resources/images/FN-AH948_FN_WAL_M_20190820023517.jpg)
New Square Mile developments will be subject to wind guidelines after the construction of some of the area’s largest skyscrapers formed wind tunnels that pose a danger to cyclists and pedestrians.
The guidelines, launched by the City of London Corporation, the financial district’s local authority, provide developers with a framework to measure the impact new buildings might have on wind conditions in surrounding areas.