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Evaluation of Work Zone Speed Reduction Measures. Ali Kamyab Tom Maze Steve Gent Steve Schrock January 9, 2001. Center for Transportation Research and Education Iowa State University, Ames, Iowa. Survey. 12 pages Sent to: 50 State Transportation Agencies 14 Toll Road Authorities

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evaluation of work zone speed reduction measures

Evaluation of Work Zone Speed Reduction Measures

Ali Kamyab

Tom Maze

Steve Gent

Steve Schrock

January 9, 2001

Center for Transportation Research and Education

Iowa State University, Ames, Iowa

survey
Survey
  • 12 pages
  • Sent to:
    • 50 State Transportation Agencies
    • 14 Toll Road Authorities
  • 39 Returned (62%) Response Rate
    • 37 State Transportation Agencies
    • 2 Toll Road Authorities
question 1 policy description
Question 1 - Policy Description
  • Does your state have a policy on reducing or managing traffic speeds in work zones?
    • Policy: an automatic process governing the decision to reduce or manage…
  • 28 Agencies (72%) have a Policy
  • Varied Responses
question 2 policy procedure
Question 2 - Policy Procedure
  • How was your policy established?
  • Varied Responses
  • 22 Agencies, “Bottom-Up”
    • Engineering Level
  • 6 Agencies, “Top-Down”
    • Legislative Mandate or Directive
question 3 scenarios
Question 3 - Scenarios
  • Drawings of Traffic Control Layouts
  • Questions:
    • Existing Non-Work Zone Speed Limit
    • Regulatory Work Zone Speed Limit
    • Advisory Work Zone Speed Limit
speed limit signs
Speed Limit Signs

Regulatory

Advisory

scenario 1 mobile operation 2 lane 2 way
Scenario 1 -Mobile Operation (2-lane/2-way)
  • Reg. Speed Reduction: 1
  • Adv. Speed Reduction: 8
    • Generally 10 mhp
  • No Speed Reduction: 20
  • No Information: 9
  • Not Applicable: 1
scenario 2 mobile operation multilane div
Scenario 2 -Mobile Operation (multilane-div)
  • Reg. Speed Reduction: 2
  • Adv. Speed Reduction: 6
    • Generally 10-15 mhp
  • No Speed Reduction: 26
  • No Information: 5
  • Not Applicable: 0
scenario 3 lane closure w o barrier
Scenario 3 -Lane Closure (w/o barrier)
  • Reg. Speed Reduction: 26
    • Generally 10 mhp
  • Adv. Speed Reduction: 4
  • No Speed Reduction: 4
  • No Information: 5
  • Not Applicable: 0
scenario 4 lane closure w barrier
Scenario 4 -Lane Closure (w/ barrier)
  • Reg. Speed Reduction: 26
    • Generally 10 mhp
  • Adv. Speed Reduction: 6
  • No Speed Reduction: 2
  • No Information: 5
  • Not Applicable: 0
scenario 5 lane closure on bridge
Scenario 5 -Lane Closure on Bridge
  • Reg. Speed Reduction: 27
    • Generally 10 mhp
  • Adv. Speed Reduction: 6
  • No Speed Reduction: 0
  • No Information: 6
  • Not Applicable: 0
scenario 6 lane shift multilane
Scenario 6 - Lane Shift (multilane)
  • Reg. Speed Reduction: 18
    • Generally 10 mhp
  • Adv. Speed Reduction: 2
  • No Speed Reduction: 11
  • No Information: 6
  • Not Applicable: 2
scenario 7 median crossover multilane
Scenario 7 - Median Crossover (multilane)
  • Reg. Speed Reduction: 30
    • Generally 10 mhp
  • Adv. Speed Reduction: 0
  • No Speed Reduction: 0
  • No Information: 9
  • Not Applicable: 0
question 6 most effective system
Question 6 -Most Effective System
  • 25 Agencies Responded
  • Police Enforcement - 17 Agencies
  • Realistic Speed Limits - 3 Agencies
concluding remarks
Concluding Remarks
  • Moving Work Zones:
    • Most Agencies – No Reg. Or Adv Speed Reduction
  • Lane Closure on Interstate:
    • Most Agencies – Reg. Speed Reduction
    • Generally 10 mph
  • Interstate Crossover/Head-to-Head Traffic
    • All Agencies – Reg. Speed Reduction
  • Police enforcement:
    • Most Effective Speed Reduction System