You may discover why the road over Steingrímsfjarðarheiði was opened in 1984 if you drive over Þorskafjarðarheiði late in the autumn like I did. Namely the snow.
The cache is placed at an shelter from 1956 that was, and still are, used when the storms get to rough to continue the travel over Þorskafjarðarheiði.
The road is wide and well marked with yellow stickers with reflectives so it's possible to drive here when there are less than 50 cm snow.
