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Revisions to Chapter 2C – Warning Signs and Object Markers

This revision introduces changes to warning signs and object markers, including new sign designs and spacing guidelines. It also provides new criteria for determining advisory speeds and introduces new signs for adverse weather conditions and road flooding.

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Revisions to Chapter 2C – Warning Signs and Object Markers

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  1. Revisions to Chapter 2C – Warning Signs and Object Markers

  2. Some word message signs are deleted Also – STOP AHEAD, YIELD AHEAD, SIGNAL AHEAD

  3. Fluorescent yellow-green color Required for school and school bus signs Optional for pedestrian, bike, and playground signs

  4. 36” x 36” minimum size formulti-lane conventional roads

  5. Guidelines for advance placement of warning signs – Table 2C-4 • Change to 20/40 visual acuity • Assumption of legibility distance of 180 feet for Condition A (speed reduction and lane change) • Assumption of minimum legend size of 6” lettering; if less, add 100 feet • Assumption of legibility distance of 250 feet for Condition B (stop and deceleration)

  6. Application of horizontal alignment signs based uponcurve differential speed

  7. New criteria for the determination of advisory speeds Support: Among the established engineering practices that are appropriate for the determination of the recommended advisory speed for a horizontal curve are the following: • An accelerometer that provides a direct determination of side friction factors • A design speed equation • A traditional ball-bank indicator using the following criteria: 16 degrees of ball-bank for speeds of 20 mph or less 14 degrees of ball-bank for speeds of 25 to 30 mph 12 degrees of ball-bank for speeds of 35 mph and higher

  8. New variations of combination horizontal alignment-intersection warning signs

  9. Chevron signs may be mounted at 4-foot height

  10. New table for recommended spacing of Chevron signs

  11. New table for spacing of Chevron signs

  12. Advisory Curve Speed sign is deleted

  13. New combination horizontal alignment/advisory exit or ramp speed signs

  14. New Freeway Ends and Expressway Ends signs

  15. New sign for use where a freeway or expressway ends and drivers must leave the facility on an exit ramp

  16. New shoulder signs and plaques

  17. New Surface Condition signs

  18. New signs and plaque to warn of conditions that primarily affect motorcyclists

  19. No Center Line sign

  20. New warning signs for adverse weather conditions

  21. New warning signs for road flooding

  22. New warning signs for ramp metering

  23. Speed limit reductions of more than 10 mph Reduced Speed Limit Ahead (W3-5) sign recommended

  24. New Drawbridge sign

  25. No Merge Area plaque

  26. Freeway lane drop advance warning

  27. New Roundabout plaque for circular intersection warning

  28. Offset side roads and double side roads

  29. New sign and plaque for combined pedestrian/bicycle crossing

  30. New symbol signs to warn of possible presence oflarge animals

  31. New sign to warn of a traffic pattern revision

  32. Order of names and use of arrows when two street names appear on an advance street name plaque

  33. Plaques for use when STOP signs control all but one approach to the intersection

  34. Share the Road plaque cannot be used alone; can ONLY be used to supplement another sign

  35. “New” plaque for mounting above a regulatory or advance warning sign to warn road users about a new regulation or condition

  36. Object markers have been relocated from Part 3

  37. Object Markers for Approach Ends of Guardrails • Where Type 3 object markers are applied to the approach ends of guardrail and other roadside appurtenances, sheeting without a substrate shall be directly affixed to the approach end of the guardrail in a rectangular shape conforming to the size of the approach end of the guardrail, with alternating black and retroreflective yellow stripes sloping downward at a angle of 45 degrees toward the side of the obstruction on which traffic is to pass.

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