mandatory
mandatory sighs are road sighs which are used to set the obligations of all traffic which use a specific area of road.
Electrical Hazard
is that you have to watch out for electric stuff that might shock you.
prohibitive sighs
Prohibitive sighs
stuff you do not do in class or anywhere that have this sigh.
my own sigh
tripping hazard is something that is dangerous when you are in a work area.4
