Answer: Flashing arrow signs
Step-by-step explanation:Flashing arrow signs are the symbols or signs that are used in the form of warning that is provided to the drivers on the road to indicate about the warning in advance regarding the construction work or any particular work zone is present on that road .
These warning helps the drivers to become attentive while moving on the road so that they meet any accident due to that .Also these signs are help to the construction worker because they don't face much problem due to the advance sign.