The road measures 7.56 miles long and would take a car obeying speed limits 13 minutes to travel its length.
The B556 is a B Road and is located in the Zone 5 Highways Region.
This is a true long-distance route, journeying through numerous towns like RADLETT, Shenley, London Colney, South Mimms, and POTTERS BAR.
The road is located entirely within Hertfordshire.