fhwa project: development and demonstration of pavement friction ... mergenmeier.pdf · development...
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FHWA Project: Development and Demonstration of Pavement Friction Management Programs
Andrew Mergenmeier, P.E.
Senior Pavement and Materials Engineer
FHWA Resource Center
September 24, 2012
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Development and Demonstration of Pavement Friction Management Programs (PFMP) – Goals
• Reduce Highway Crashes and Related Fatalities
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Development and Demonstration of Pavement Friction Management Programs (PFMP) - Objectives
• Establish investigatory (desirable) and intervention (minimum) thresholds for pavement surface friction and macro-texture for various classes of highway facilities (friction demand categories)
• Demonstrate state of art friction/texture measurement equipment
• Work with approximately 4 state DOT’s to develop a PFMP
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Development and Demonstration of Pavement Friction Management Programs (PFMP) - Background
• 2008 AASHTO Guide for Pavement Friction • 23 CFR 924 Highway Safety Improvement Program – safety
database • Many state DOT’s have executive level performance goals to
reduce fatalities • Improved friction/texture measurement technology
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US Locked Wheel
Center for
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Locked Wheel
Center for
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Continuous Friction Fixed-slip
Center for
0
1.2
0 100
Tire Slip, %
Peak friction
Full Sliding friction
(fully locked) Increased Braking
Critical slip
Intermittent sliding
(free rolling)
Coefficient of Friction
Pavement surface influence area
Tire influence area
(after Henry, 2000)
𝜇 = 𝐹𝑥𝐹𝑦
=𝐹𝑥𝑊
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0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.65
A Motorway
B Dual carriageway non-event
C Single carriageway non-event
Q Approaches to and across minor and major junctions, approaches to roundabouts
K Approaches to pedestrian crossings and other high risk situations
R Roundabout
G1 Gradient 5-10% longer than 50m
G2 Gradient >10% longer than 50m
S1 Bend radius < 500m - dual carriageway
S2 Bend radius < 500m - single carriageway
Investigatory level (50 or 80 km/h)Site category and definition
Friction Demand - Investigatory Levels (UK-English)
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Development and Demonstration of Pavement Friction Management Programs (PFMP) - Status
• Consortium led by Virginia Tech selected through RFP process • Procure equipment - 2013 • Select state DOT’s for demonstration – 2013
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Friction measurement equipment
1 Effectiveness in the prediction of (fatal) crash potential 2 Continuous friction measurement capability and operating
principle; slip ratio 3 Macrotexture measurement 4 Stage of development of the device (experimental or
commercially available) 5 Robustness and readiness for deployment 6 Data collection productivity 7 Measurement speed 8 Precision (Repeatability and Reproducibility) 9 Global Positioning System (GPS) 10 Software
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Development and Demonstration of Pavement Friction Management Programs (PFMP) – State DOT interest
• Organizational goals to reduce fatalities • Friction and crash analysis experience • 2008 AASHTO Guide for Pavement Friction experience • Geographic diversity • Aggregate friction quality • Interest in cooperating
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Pavement Friction Management Programs Andrew Mergenmeier P.E. Senior Pavement and Materials Engineer FHWA Resource Center
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