The road measures 15.84 miles long and would take a car obeying speed limits 27 minutes to travel its length.
The B3257 is a B Road and is located in the Zone 3 Highways Region.
This is a true long-distance route, journeying through numerous towns like Altarnun, Lewannick, Congdons Shop, Coads Green, Linkinhorne, Bray Shop, CALLINGTON, Polhilsa, Kelly Bray, Higher Downgate, Kit Hill, Clitters, Monks Cross, Sherwell, Sevenstones, Bere Alston, TAVISTOCK, Morwell, and Gulworthy.
The road connects Cornwall and Devon.