The road measures 15.36 miles long and would take a car obeying speed limits 22 minutes to travel its length.
The B6400 is a B Road and is located in the Zone 6 Highways Region.
This is a true long-distance route, journeying through numerous towns like Ashkirk, SELKIRK, MELROSE, Lilliesleaf, Ancrum, and JEDBURGH.
The road connects Roxburgh, Ettrick and Lauderdale and Roxburgh, Ettrick and Lauderdale.