Highway warning signs are an important part of road safety, providing drivers with information about potential hazards and other important information. The crossword solutions for the term 'highway warning sign' include SLO (3 letters), BUMP (4 letters), CUTSPEED (8 letters), EXITONLY (8 letters), LOWBRIDGE (9 letters), DONOTENTER (10 letters), and DANGEROUSCURVES (15 letters). SLO stands for 'speed limit only, ' indicating that drivers should adhere to the posted speed limit. BUMP is a warning sign that indicates a BUMP or dip in the road ahead. CUTSPEED is a warning sign that tells drivers to reduce their speed due to a sharp curve ahead. EXITONLY is a sign that indicates that the road ahead is an exit only. LOWBRIDGE is a warning sign that indicates a low bridge ahead. DONOTENTER is a sign that warns drivers not to enter a certain area. Finally, DANGEROUSCURVES is a warning sign that indicates a dangerous curve ahead.