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Difficulty: MediumSpecial Zone Signs and Markings

While driving on a multi-lane highway, you enter a designated work zone and notice a portable electronic arrow board displaying a flashing horizontal bar across the panel rather than a directional arrow pointing left or right. What action should you take?

  1. Continue safely in your current lane with heightened caution, as the signal indicates caution mode rather than a lane closure.Answer
  2. B
    Execute an immediate lane change into the adjacent left lane under the assumption that your lane is closed ahead.
  3. C
    Accelerate above the posted work zone speed limit to clear the construction area as quickly as possible.
  4. D
    Move onto the paved right shoulder to pass slower construction vehicles operating in the lane.

Answer

Continue safely in your current lane with heightened caution, as the signal indicates caution mode rather than a lane closure.
On portable arrow boards used in construction and work zones, a flashing horizontal line, bar, or four flashing corners communicates caution mode. This warns drivers that maintenance or hazard activity is taking place on or near the roadway without requiring traffic to merge out of the lane.

Step-by-Step Solution

1
Identify the signal displayed on the arrow board.
Recognize that a flashing horizontal bar (or line mode) signifies caution, not a directional lane merge command.
Arrow boards display solid directional arrows when a lane is closed, whereas flashing bars or four corners serve as caution warnings.
2
Determine the appropriate driving response.
Maintain your lane, reduce speed to safe work zone levels, and maintain increased alertness.
Unnecessary lane changes disrupt traffic flow and create collision risks in work zones.

Key Concept

Work Zone Electronic Arrow Board Display Signals
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Topics

Special Zone Signs and Markings

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