Carnglaze Caverns can best be found off the A38. From Liskeard, there are brown tourist signs directing to Carnglaze just before Trago Mills. From Bodmin the signs are just past Trago Mills.
From the A30, turn off at the sign for Colliford Lake and follow the signs to St Neot. Drive through the village and Carnglaze is about a mile south of the village, on the left.
(Routes are highlighted in red on the map below.)