Swedish to English Tech/Engineering Construction / Civil Engineering

Väl fungerande (((försäkringsmarkeringar (röd hage)))) skall finnas vid stompunkter

I am inclined to translate the first word as 'safety or security markings' - but am left wondering why they have chosen 'försäkrings-' over 'säkerhets-.' Perhaps the difference is the intended recipient of the safeguarding (i.e. 'säkerhets' markings prevent against harm to passersby/users, while ''försäkrings-' markings protect the stompunkt (control point) itself from tampering/removal?)

My second issue is with "röd hage," which to my knowledge can only be understood as a red field or pasture! Not to be found in glossaries or Google. I have an inkling from the German 'Haken' (check mark) but that would need confirmation.

Anyone?