The road measures 4.99 miles long and would take a car obeying speed limits 7 minutes to travel its length.
The A405 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 Leavesden, WATFORD, Bricket Wood, Park Street, and ST. ALBANS.
The road is located entirely within Hertfordshire.