What does this sign alert drivers to?

• There will be a speed bump ahead.
• Rumble strips are present before a work zone, signaling caution and potential lane closures.
  Explanation:

  "This sign warns motorists of black or orange strips placed across the travel lanes before work zones, signaling caution and potential lane closures."
• The road surface ahead is smooth and clear.
• Drivers should increase their speed before the work zone.