The road measures 9.37 miles long and would take a car obeying speed limits 19 minutes to travel its length.
The A121 is a A Road and is located in the Zone 1 Highways Region.
This is a true long-distance route, journeying through numerous towns like WALTHAM CROSS, WALTHAM ABBEY, EPPING, LOUGHTON, BUCKHURST HILL, and WOODFORD GREEN.
The road passes through several counties, including Hertfordshire, Essex, and Greater London.