The term 'ROAD SIGN WARNING' can be broken down into four crossword solutions: SLO (3 letters), SLOW (4 letters), DIP (3 letters), and DONOTENTER (10 letters). SLO is an abbreviation for the word 'SLOW, ' which is a warning to drivers to reduce their speed. SLOW is another way of saying the same thing. DIP is a warning to drivers to SLOW down and prepare for a DIP in the road. DONOTENTER is a warning to drivers not to enter a certain area, such as a one-way street or a restricted area. All of these warnings are important for drivers to follow in order to ensure their safety and the safety of others on the road.