These are on the ring road in Olfus, next to Ingolfsfjall and Kogunarholl.
They are there to mark all lethal car accident on the ring road from Reykjavik to Selfoss. One cross for each lethal car accident.
ruslendingur (2009-12-22)
GPS coordinates
63° 57,460'N, 21° 4,717'W (ISN93: 398.146, 385.474)
It is located between Selfoss and Hveragerði, at the foot of Ingólfsfjall (Mount Ingolf)