Orange Zone, One Lane, and a Flagger Who Steps Out
You are northbound on a four-lane arterial in the Phoenix area at 45 mph. A work zone begins 500 feet ahead: orange diamond signs, an orange rectangular sign reading 'ROAD WORK AHEAD,' and a lane-closure arrow board directing traffic to the left lane. The right lane is coned off starting at the arrow board. Traffic is moderate. As you approach, a flagger in an orange vest steps into the closed right lane and holds up a paddle showing SLOW on one side. Your lane is moving at about 40 mph and the car ahead of you is 2 seconds in front.
1. What does the flagger's SLOW paddle require of you, and how does it interact with the arrow board?
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Orange means temporary traffic control, and a flagger's paddle is a direct instruction that outranks the general speed limit and the arrow board's lane guidance. SLOW means proceed with caution at a reduced speed, prepared to stop, not 'stop now.' The arrow board is telling you the right lane is closed and to merge left; the flagger is telling you to moderate speed through the taper and work area. So the combined instruction is: complete your merge into the left lane, then reduce speed below 40 mph and stay alert for workers and equipment. You should not stop dead in a live lane unless the flagger turns the paddle to STOP, and you should not treat SLOW as permission to maintain 45 mph because the posted limit has not changed yet.
2. The car ahead brakes suddenly. What is your safest sequence of actions, and what mistake should you avoid in a work zone?
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With only a 2-second following gap at 40 mph, you have limited margin. The safest sequence is: release the accelerator immediately, apply firm but progressive braking while checking the mirror for the car behind, and hold your lane rather than swerving into the coned-off right lane. The closed lane may contain workers, equipment, or an uneven surface, so it is not an escape route. The classic work-zone mistake is to 'use' the closed lane to pass or to dive into it to avoid a rear-end collision; that converts a fender-bender risk into a worker-strike risk. Increase your following distance once past the taper, because work zones compress space and produce sudden speed changes.