» In work zones, barriers such as drums, panels and cones are used to:

In work zones, barriers such as drums, panels and cones are used to:

Reduce the flow of traffic.
Distract drowsy drivers.
Warn drivers of potentially dangerous conditions.
Keep workers out of the work zone.
Explanation

Barriers such as drums, vertical panels, cones and tubular markers warn drivers of unusual or potentially dangerous conditions in work areas, and are used to guide drivers safely through work zones.

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This question appears in the following DMV practice tests:
Idaho DMV Practice Test 7Texas DPS Practice Test 7Illinois DMV Practice Test 8Montana DMV Practice Test 10Hawaii DMV Practice Test 11South Carolina DMV Practice Test 12Vermont DMV Practice Test 13