Braess's paradox
Videos
Braess's paradox is the observation that adding one or more roads to a road network can slow down overall traffic flow through it. The paradox was first discovered by Arthur Pigou in 1920, and later n
When an expressway in Seoul was removed so a creek could be restored, traffic flow in the area improved
Cheonggyecheon
Videos
Cheonggyecheon is a 10.9-kilometre-long stream and public space in downtown Seoul, South Korea. A natural stream sourced from the Suseongdong Valley in Inwangsan, it was historically maintained as par
Braess's paradox
…reduction of individual commuting time. In Seoul, South Korea, traffic around the city sped up when the Cheonggye Expressway was removed as part of the Cheonggyecheon restoration project. In Stuttgart, Germany, after investments into the road network in 1969, the traffic situation did not improve until a section of…
Cheonggyecheon at sunrise
Cheonggyecheon in 1904
Cheonggyecheon under restoration in 2005
Shortly after reopening in 2005.