The parallel roads are found just off the A86 at Roybridge .
By taking the minor road for Glen Roy / Bohuntine you will eventually reach a car park where you can view the parallel roads .
The strange lines in the mountain side were caused by a huge lake that used to fill the glen approx 10,000 years ago . The water was held there by a glacier and the lines are the levels of the shoreline at various times in its existence .
The levels range from 260 , 325 and 350m