Automated Cross-Slope and Drainage Path Method AASHTO TECHNOLOGY - - PowerPoint PPT Presentation

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Automated Cross-Slope and Drainage Path Method AASHTO TECHNOLOGY - - PowerPoint PPT Presentation

Feb 11, 2024 370 likes •760 views

AASHTO Automated Cross-Slope and Drainage Path Method AASHTO TECHNOLOGY IMPLEMENTATION GROUP Presentation Outline: Contributing factors to Hydroplaning Traditional and Automated Survey Methods Multi-Purpose Survey Vehicle (MPSV) and

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AASHTO

Automated Cross-Slope and Drainage Path Method

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AASHTO TECHNOLOGY IMPLEMENTATION GROUP

Presentation Outline:

  • Contributing factors to Hydroplaning
  • Traditional and Automated Survey Methods
  • Multi-Purpose Survey Vehicle (MPSV) and

Subsystems

  • Automated Cross-Slope Analysis Program (ACAP)
  • Field Validation
  • Examples
  • Conclusion
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AASHTO TECHNOLOGY IMPLEMENTATION GROUP

Factors that contribute to hydroplaning:

  • Driver
  • Vehicle
  • Environment
  • Pavement Surface (geometry, condition, drainage)
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AASHTO TECHNOLOGY IMPLEMENTATION GROUP

Pavement

  • Cross-slope

Facilitates/hampers drainage

  • Grade

Affects drainage path (DP)

  • Rutting

Increases water retention

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AASHTO TECHNOLOGY IMPLEMENTATION GROUP

Traditional Survey Methods

  • Slow and labor intensive
  • Expose crew to hazardous conditions
  • Require traffic control
  • Cause inconvenience to traveling public
  • Costly
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AASHTO TECHNOLOGY IMPLEMENTATION GROUP

Automated Survey Methods

  • Fast (highway speed)
  • Safe (no traffic control required)
  • Efficient

(simultaneous data collection)

  • Cost-Effective
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AASHTO TECHNOLOGY IMPLEMENTATION GROUP

Automated Cross-Slope and Drainage Path Method

  • Multi-Purpose Survey Vehicle (MPSV) to collect pavement

data, and

  • Automated Cross-Slope Analysis Program (ACAP) to analyze

data

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AASHTO TECHNOLOGY IMPLEMENTATION GROUP

Multi-Purpose Survey Vehicle (MPSV)

  • Inertial Profiling System
  • Position and Orientation

System (POS)

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AASHTO TECHNOLOGY IMPLEMENTATION GROUP

Multi-Purpose Survey Vehicle (MPSV)

  • Inertial Profiling System
  • Position and Orientation

System (POS)

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AASHTO TECHNOLOGY IMPLEMENTATION GROUP

Inertial Profiling System

  • Three height laser sensors
  • Two accelerometers
  • Distance Measurement Indicator

(DMI)

  • Automatic Trigger System
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AASHTO TECHNOLOGY IMPLEMENTATION GROUP

Multi-Purpose Survey Vehicle (MPSV)

  • Inertial Profiling System
  • Position and Orientation

System (POS)

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AASHTO TECHNOLOGY IMPLEMENTATION GROUP

Position and Orientation System (POS)

  • Differential Global Positioning System (DGPS)
  • Inertial Measurement Unit (IMU)
  • Distance Measurement Indicator (DMI)
  • POS Computer
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Differential Global Position System (DGPS)

  • Roof antennas
  • Receiver (12 channel)
  • Differential correction signal
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AASHTO TECHNOLOGY IMPLEMENTATION GROUP

Inertial Measurement Unit (IMU)

  • Generates tilt, roll and yaw data
  • 3 accelerometers
  • 3 gyroscopes
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AASHTO TECHNOLOGY IMPLEMENTATION GROUP

Distance Measuring Indicator (DMI)

  • Linear distance referencing
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AASHTO TECHNOLOGY IMPLEMENTATION GROUP

POS Computer

  • Data storage and processing

POS Computer

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AASHTO TECHNOLOGY IMPLEMENTATION GROUP

Input Data from MPSV

  • Cross-Slope
  • Grade
  • Rutting
  • Linear Reference (Distance)
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AASHTO TECHNOLOGY IMPLEMENTATION GROUP

Automated Cross-Slope Analysis Program (ACAP)

  • Imports MPSV data (cross-slope, grade, rutting, distance)
  • Calculates drainage path length
  • Generates outputs (tabular and graphical)
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AASHTO TECHNOLOGY IMPLEMENTATION GROUP Automated Cross-Slope Analysis Program (ACAP)

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AASHTO TECHNOLOGY IMPLEMENTATION GROUP

Drainage Path Length Calculation

DP2 = (WC

2)[1+(SG/SC)2] (1) WC = pavement width (ft)

SG = grade (ft/ft) SC = cross-slope (ft/ft)

(1) John C. Glennon: “Hydroplaning – The Trouble With Highway Cross-Slope” (January 2003)

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AASHTO Automated Cross-Slope Analysis Program (ACAP) Text Report

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AASHTO

Automated Cross-Slope Analysis Program (ACAP)

Tabular Output

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AASHTO TECHNOLOGY IMPLEMENTATION GROUP Automated Cross-Slope Analysis Program (ACAP) 2D Graphical Output

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AASHTO TECHNOLOGY IMPLEMENTATION GROUP Automated Cross-Slope Analysis Program (ACAP) 3D Graphical Output (work in progress)

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AASHTO TECHNOLOGY IMPLEMENTATION GROUP

Field Validation

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MPSV Cross-Slope Precision

  • Repeatability: 0.06%
  • Accuracy: ± 0.13 %
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AASHTO TECHNOLOGY IMPLEMENTATION GROUP

Case Example 1

Problem: Shallow cross-slope within super elevation of interstate Consequence: Vehicle departures reported

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AASHTO TECHNOLOGY IMPLEMENTATION GROUP Notice This Zero Value

Before After

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AASHTO TECHNOLOGY IMPLEMENTATION GROUP

Case Example 2

Problem: Poor pavement drainage reported on 6-lane rural interstate Consequence: Roadway departures reported

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Before Corrective Action

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Short-Term Preventive Action

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Short-Term Preventive Action

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Short-Term Solution

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Long-term Solution

  • Milling
  • Overbuild
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Observations

  • Substantial cross-slope improvement
  • Smoother transition in and out of super-elevation
  • Elimination of surface drainage problem
  • No new roadway departures reported
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AASHTO TECHNOLOGY IMPLEMENTATION GROUP

Automated Cross-Slope and Drainage Path Method

  • Identifies areas of pavement prone to hydroplaning
  • For design, construction and safety projects
  • Assists in developing short and long term solutions
  • Safe, fast and very effective
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AASHTO TECHNOLOGY IMPLEMENTATION GROUP

Thank You !