Right you are traveling upstream on the river at dusk you see a movie with the number 4 in flashing red light what should you do?

If you see a flashing red light with the number 4 while traveling upstream on a river, it typically indicates a navigational warning or hazard. You should slow down and proceed with caution, as this could signal a danger ahead, such as a dam or an obstruction. It’s essential to stay alert and look for additional signs or markers to ensure safe navigation. Always prioritize safety and be prepared to change your course if necessary.