Answer:
When you see road workers at a construction site, you should obey their instructions: c. at all times
Explanation:
When driving the road, the driver should pay special attention to all that is going on around him. Not only the traffic signs, but also the accidents that may occure and also if a road is being fixed.
When seing road workers at a construction site, they have authority to guide the people coming near the construcion for safty matters, this is why a driver should obey their instructions at all times.