The road measures 13.73 miles long and would take a car obeying speed limits 43 minutes to travel its length.
The A4020 is a A Road and is located in the Zone 4 Highways Region.
This is a true long-distance route, journeying through numerous towns like Uxbridge, Denham, Hillingdon, Hayes, Yeading, Southall, Greenford, Hanwell, West Ealing, Ealing, Acton, Hammersmith, and Shepherds Bush.
The road connects Buckinghamshire and Greater London.