Not even sure if it is a road sign, but ...
Image driving from Orient to Grand Case, going down the hill and the road swerves left - just before the curve to the left, on the passenger side of the road is what appears to me to be a black painted human form with a red lightening bolt head level. There is another one, same side of the road approacing Grande Case, not sure where exactly, but past the turn to the GC airport I think.

Whenever we drove past always meant to ask what they were, but kept forgetting.

Anyone?
J&B