The road measures 4.73 miles long and would take a car obeying speed limits 12 minutes to travel its length.
The A409 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 Bushey Heath, BUSHEY, Stanmore, Harrow, and Harrow Weald.
The road connects Hertfordshire and Greater London.