caution in red color on white background

workplace white warningzone warningmessage warning unsafe traffic themes symbolsafety symbol suitable sign security safetyprotocol safetymeasures safetyhazard safetyfirst safetyalert safety safeguard riskmanagement risk red protectionzone protection precaution isolated emergencyalert emergency dangerwarning dangerous danger color cautionarysign cautionary caution beaware background attention alertsymbol alertsign alertrelated alert