The road measures 13.69 miles long and would take a car obeying speed limits 23 minutes to travel its length.
The A3078 is a A Road and is located in the Zone 3 Highways Region.
This is a true long-distance route, journeying through numerous towns like St. Mawes, St. Just In Roseland, Portscatho, Ruan High Lanes, Tregony, and Probus.
The road is located entirely within Cornwall.