Work Zone at Dusk: Flagger, Cones, and Conflicting Markings
At 7:40 p.m. in October, your student is driving a two-lane road with a posted 45 mph limit. Ahead, orange cones taper the northbound lane into the southbound lane. A flagger holds a SLOW paddle, and a large dump truck is backing toward the travel lane. The permanent double yellow line is still visible under the cones, and the temporary white edge line curves left. Low sun glare is in your student's eyes. Your student says, 'The flagger is letting me go, so I can pass the truck.' A worker on foot is about 20 feet from the lane, and there is no advance 'lane closed ahead' sign, only cones. Your student is 30 feet behind the truck and closing.
1. When the flagger, cones, and permanent markings conflict, what should your student obey, and what should override even the flagger?
Read the worked answer
The flagger's direction is the primary control in a work zone, followed by temporary traffic control devices such as cones and temporary markings, then the permanent markings. But the flagger's SLOW paddle does not authorize driving into a visible hazard. Here a dump truck is backing toward the travel lane and a worker is 20 feet away. The student must slow to a crawl or stop, not pass the truck. A flagger can signal that traffic may proceed, but the driver still must ensure the path is clear. If the truck is still moving into the lane, the student should wait behind the cone taper until the truck is clear and the flagger gives a clear go-ahead. Never pass the flagger or the truck inside the taper.
2. What should your student do about the double yellow line and the temporary white edge line?
Read the worked answer
The temporary white edge line and cones show the intended path through the work zone, so the student should follow them rather than the permanent double yellow line. If the temporary alignment puts traffic into the opposing lane, crossing the double yellow is permitted only when the work zone directs it and only after yielding to oncoming traffic. The student should not straddle the line blindly or use the opposing lane to pass the truck. With sun glare, the student should reduce speed further, use the visor, and keep a gap so the temporary markings stay visible. The key judgment is that temporary markings govern the work zone, but they do not create a right-of-way over oncoming traffic or over workers and equipment.
3. Identify the hazards and explain the speed and space management you would coach.
Read the worked answer
Hazards include the backing dump truck, the worker on foot, the lane taper, sun glare, the missing advance warning sign, and the student's closing speed at 30 feet. At 45 mph the student is covering about 66 feet per second, so 30 feet is less than half a second of margin. Coach the student to slow well before the taper, cover the brake, and create an escape space to the right or left. Do not pass the truck; wait for it to clear. Increase following distance from the truck, scan under and around the glare, and expect stopped traffic beyond the curve. The correct speed is a crawl until the worker, truck, and taper are behind the vehicle.