The road measures 11.79 miles long and would take a car obeying speed limits 25 minutes to travel its length.
The A4251 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 TRING, New Ground, Aldbury, Cow Roast, Dudswell, Northchurch, BERKHAMSTED, HEMEL HEMPSTEAD, Winkwell, Felden, and KINGS LANGLEY.
The road is located entirely within Hertfordshire.