High Friction Surface Treatments ATSSA 2016
HIGH FRICTION SURFACE TREATMENTS Darren McDaniel, P.E. Presented by Chris Lindsey, P.E. Date
Texas Safety Engineering Initiatives
February 2016
Table of Contents 1
Introduction
2
High Friction Surface Treatment in Texas Highway Safety Improvement Program
3
Systemic High Friction Surface Treatment Study
4
Evaluating the Need for Surface Treatments on Horizontal Curves
5
Questions
(TXDOT 0-6714)
Texas Safety Engineering Initiatives
3 4-6 7-11
12-16 17
February 2016
2
Introduction Safety Engineer – Darren McDaniel, P.E.– Presented by Chris Lindsey, • Transportation Engineer –Design Division
– Texas Department of Transportation
Researchers – Mike Pratt, Srinivas Geedipally, Brooke Ullman – Texas A&M Transportation Institute
Texas Safety Engineering Initiatives
February 2016
3
High Friction Surface Treatment in Texas HSIP Added to Texas Highway Safety Improvement Program in 2013 • High-friction surface treatment (Curves) • High-friction surface treatment (Intersections)
Texas Safety Engineering Initiatives
February 2016
4
High Friction Surface Treatment in Texas HSIP Crash Reduction Factor and Service Life
Texas Safety Engineering Initiatives
February 2016
5
High Friction Surface Treatment in Texas HSIP Currently, have 110 projects programmed $40 Million worth of projects First High Friction Surface Treatment is expected to be installed spring 2016 Planned evaluation process
– KAB Crash Data 3yrs before vs 3yrs after
Texas Safety Engineering Initiatives
February 2016
6
Systemic High Friction Surface Treatment Study
Texas Safety Engineering Initiatives
February 2016
7
Systemic High Friction Surface Treatment Study
Systemic HFST Criteria Curve Risk Factors
Wet Weather Crashes Skid Values
Texas Safety Engineering Initiatives
February 2016
8
Systemic High Friction Surface Treatment Study
Curve Risk Factors ADT (vehicles per day)
Lane & Shoulder Widths Truck Presence Alignment
Texas Safety Engineering Initiatives
February 2016
9
Systemic High Friction Surface Treatment Study
Wet Weather Crashes Identify Locations Higher than the Statewide Average for Percentage of Wet Weather Crashes
Statewide Average Percentage of Wet Weather Crashes in Texas in 2014 14.21 % Rural 12.32 % Urban Texas Safety Engineering Initiatives
February 2016
10
Systemic High Friction Surface Treatment Study
Skid Testing Pavement Management Information System (PMIS) Skid testing is performed annually on approximately 25% of TxDOT maintained mileage (50% of the interstate)
Texas Safety Engineering Initiatives
February 2016
11
Evaluating the Need for Surface Treatments on Horizontal Curves (TXDOT 0-6714)
Objectives – Assess the effectiveness of high-friction surface treatments at improving curve safety. How well do they work? – Develop guidelines for application of high-friction surface treatments. When and where are they needed?
Scope – Horizontal curves
– High-speed roadways
Texas Safety Engineering Initiatives
February 2016
12
Evaluating the Need for Surface Treatments on Horizontal Curves (TXDOT 0-6714)
Safety Data Analysis – Crash trends on curves
• All crashes • Wet-weather crashes • Run-off-road crashes
Operational Data Analysis – Curve speeds in advance of, and throughout, the curve
– Lane placement in the curve
Texas Safety Engineering Initiatives
February 2016
13
Evaluating the Need for Surface Treatments on Horizontal Curves (TXDOT 0-6714)
Safety Data Analysis
Operational Data Analysis – Curve speed models – Lane placement models & insights into path corrections
Crash Modification Factor
– Skid number CMF
3
All crashes Wet-weather crashes Run-off-road crashes Wet-weather run-off-road crashes
2.5 2 1.5 1 0.5 0 0
20
40
60
80
100
Skid Number
Spacek, 2005 Texas Safety Engineering Initiatives
February 2016
14
Evaluating the Need for Surface Treatments on Horizontal Curves (TXDOT 0-6714)
Evaluate Curve using Margin of Safety Analysis
Improved by treatment Low margin of safety at PC
Texas Safety Engineering Initiatives
February 2016
15
Evaluating the Need for Surface Treatments on Horizontal Curves (TXDOT 0-6714)
Expected Benefits – Reduction in crash and injury frequency (particularly in wet weather) – More effective diagnosis of curve safety problems • Location along curve • Adequacy of skid resistance in wet-weather conditions
– Identification of more cost-effective curve treatments
Texas Safety Engineering Initiatives
February 2016
16
Closure
Questions/Comments? For More Information – Darren McDaniel, [email protected], (512) 416-3331 – Wade Odell, [email protected], (512) 416-4737 – Mike Pratt, [email protected], (979) 845-1907
Texas Safety Engineering Initiatives
February 2016
17
Texas Safety Engineering Initiatives
February 2016
Table of Contents 1
Introduction
2
High Friction Surface Treatment in Texas Highway Safety Improvement Program
3
Systemic High Friction Surface Treatment Study
4
Evaluating the Need for Surface Treatments on Horizontal Curves
5
Questions
(TXDOT 0-6714)
Texas Safety Engineering Initiatives
3 4-6 7-11
12-16 17
February 2016
2
Introduction Safety Engineer – Darren McDaniel, P.E.– Presented by Chris Lindsey, • Transportation Engineer –Design Division
– Texas Department of Transportation
Researchers – Mike Pratt, Srinivas Geedipally, Brooke Ullman – Texas A&M Transportation Institute
Texas Safety Engineering Initiatives
February 2016
3
High Friction Surface Treatment in Texas HSIP Added to Texas Highway Safety Improvement Program in 2013 • High-friction surface treatment (Curves) • High-friction surface treatment (Intersections)
Texas Safety Engineering Initiatives
February 2016
4
High Friction Surface Treatment in Texas HSIP Crash Reduction Factor and Service Life
Texas Safety Engineering Initiatives
February 2016
5
High Friction Surface Treatment in Texas HSIP Currently, have 110 projects programmed $40 Million worth of projects First High Friction Surface Treatment is expected to be installed spring 2016 Planned evaluation process
– KAB Crash Data 3yrs before vs 3yrs after
Texas Safety Engineering Initiatives
February 2016
6
Systemic High Friction Surface Treatment Study
Texas Safety Engineering Initiatives
February 2016
7
Systemic High Friction Surface Treatment Study
Systemic HFST Criteria Curve Risk Factors
Wet Weather Crashes Skid Values
Texas Safety Engineering Initiatives
February 2016
8
Systemic High Friction Surface Treatment Study
Curve Risk Factors ADT (vehicles per day)
Lane & Shoulder Widths Truck Presence Alignment
Texas Safety Engineering Initiatives
February 2016
9
Systemic High Friction Surface Treatment Study
Wet Weather Crashes Identify Locations Higher than the Statewide Average for Percentage of Wet Weather Crashes
Statewide Average Percentage of Wet Weather Crashes in Texas in 2014 14.21 % Rural 12.32 % Urban Texas Safety Engineering Initiatives
February 2016
10
Systemic High Friction Surface Treatment Study
Skid Testing Pavement Management Information System (PMIS) Skid testing is performed annually on approximately 25% of TxDOT maintained mileage (50% of the interstate)
Texas Safety Engineering Initiatives
February 2016
11
Evaluating the Need for Surface Treatments on Horizontal Curves (TXDOT 0-6714)
Objectives – Assess the effectiveness of high-friction surface treatments at improving curve safety. How well do they work? – Develop guidelines for application of high-friction surface treatments. When and where are they needed?
Scope – Horizontal curves
– High-speed roadways
Texas Safety Engineering Initiatives
February 2016
12
Evaluating the Need for Surface Treatments on Horizontal Curves (TXDOT 0-6714)
Safety Data Analysis – Crash trends on curves
• All crashes • Wet-weather crashes • Run-off-road crashes
Operational Data Analysis – Curve speeds in advance of, and throughout, the curve
– Lane placement in the curve
Texas Safety Engineering Initiatives
February 2016
13
Evaluating the Need for Surface Treatments on Horizontal Curves (TXDOT 0-6714)
Safety Data Analysis
Operational Data Analysis – Curve speed models – Lane placement models & insights into path corrections
Crash Modification Factor
– Skid number CMF
3
All crashes Wet-weather crashes Run-off-road crashes Wet-weather run-off-road crashes
2.5 2 1.5 1 0.5 0 0
20
40
60
80
100
Skid Number
Spacek, 2005 Texas Safety Engineering Initiatives
February 2016
14
Evaluating the Need for Surface Treatments on Horizontal Curves (TXDOT 0-6714)
Evaluate Curve using Margin of Safety Analysis
Improved by treatment Low margin of safety at PC
Texas Safety Engineering Initiatives
February 2016
15
Evaluating the Need for Surface Treatments on Horizontal Curves (TXDOT 0-6714)
Expected Benefits – Reduction in crash and injury frequency (particularly in wet weather) – More effective diagnosis of curve safety problems • Location along curve • Adequacy of skid resistance in wet-weather conditions
– Identification of more cost-effective curve treatments
Texas Safety Engineering Initiatives
February 2016
16
Closure
Questions/Comments? For More Information – Darren McDaniel, [email protected], (512) 416-3331 – Wade Odell, [email protected], (512) 416-4737 – Mike Pratt, [email protected], (979) 845-1907
Texas Safety Engineering Initiatives
February 2016
17
