The Chiswick flyover is a short elevated section of the M4 motorway in the western approaches to London, United Kingdom. The flyover in the west London suburb of Chiswick, was opened in 1959 with the intention of reducing congestion and the impact on local traffic of vehicles travelling around London on the North and South Circular Roads and between London and the west on the Great West Road. Although it was not originally built as a motorway, it was later incorporated into the M4 motorway.