Pedways are elevated or underground walkways, often connecting urban high-rises to each other, other buildings, or the street. They provide quick and comfortable movement from building to building, away from traffic and inclement weather. Two of the largest networks of underground walkways are located in Canada. RÉSO in Montreal and PATH in Toronto each consist of approximately 30 km of underground walkways in the heart of their respective city centres.
The concept of the elevated pedestrian way is credited to Sant'Alia an architect killed in World War One. He saw the city of the future as high rise tower blocks connected by walkways at different levels. 
- Wainwright, Oliver (2 October 2018). "Walkways in the sky: the return of London's forgotten 'pedways'". The Guardian. Retrieved 7 October 2018.
- Moore, Rowan (1 July 2018). "London Wall Place review – a high walk back to the future". the Guardian. Retrieved 7 October 2018.
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