Transcript NCHRP 20-74
Development of an Asset Management Framework for the Interstate Highway System presented to the AASHTO Performance Management Committee presented by Bill Robert Cambridge Systematics, Inc. February 2009 Transportation leadership you can trust. Outline Importance of the IHS NCHRP Project 20-74 Draft Interstate Asset Management Framework • Basic asset management concepts • Focus areas for IHS asset management • Interstate Asset Management Plan Next Steps 1 Importance of the IHS Premier highway system in the U.S. – 1% of the U.S. road network, but carries 20% of VMT Built to national standards, but cannot be managed with a “one size fits all” approach • Managed by many agencies • Great variation in physical conditions, traffic levels, etc... Every segment vital at some level (national, state, regional) A logical system on which to apply asset management principles Selected other NHS segments may be of comparable importance 2 Importance of the IHS AADT and Pavement Condition Along an IHS Corridor AADT (vehicles per day in Thousands) 350 Very Good Good 300 Acceptable Not Acceptable 250 200 150 100 50 0 0 200 100 400 300 600 500 800 700 1,000 900 1,200 1,100 Distance Along Corridor (miles) 3 1,400 1,300 1,600 1,500 1,700 NCHRP Project 20-74 Objective Develop a practical framework for applying asset management principles and practices to managing IHS investments 4 NCHRP Project 20-74 Work Steps Evaluate available performance measures, data, risk assessment approaches and analytical tools Develop an Interstate Asset Management Framework Pilot the framework Present the draft framework in a workshop Revise the framework based on the workshop Evaluate benefits and barriers to implementation Finalize the framework 5 NCHRP Project 20-74 Project Team Cambridge Systematics – prime contractor Applied Research Associates – data, risk assessment Parsons Brinckerhoff – framework development, workshop, benefits, and barriers Arora & Associates – risk assessment KLS Engineering – performance measures 6 Interstate Asset Management Framework Basic Asset Management Process Funding Levels Policy Goals and Objectives Customer Input Analysis of Options and Tradeoffs Preservation Operations Capacity Expansion Resource Allocation Decisions Financial Staff Equipment Other Program and Service Delivery System Condition and Service Levels 7 Interstate Asset Management Framework Focus Areas for IHS Asset Management Defining how to better incorporate assessment of the risks of system failure into an asset management framework Providing guidance for handling all IHS assets, particularly assets besides pavements and bridges Recommending a set of measures tailored for use in reporting and facilitating discussion of IHS performance 8 Risk Management Risk Taxonomy (adapted from NCHRP 20-59) Risk Type 9 Examples Unintentional Hazard Oil spill Hazardous materials spill Vehicular crashes Intentional Threat Terrorist attack Crime War attack Natural Hazards Heavy rain Strong wind Heavy snow and ice Earthquake Hurricanes Flood Mud/landside Performance Substandard design Construction defects Materials defects Unexpected heavy traffic Risk Management Basic Approach Identify critical infrastructure and risks Define threat/hazard scenarios Estimate scenario impacts • Ideally should base analysis on modeling of potential economic losses • Thresholding approaches (high/medium/low risk) can be used as an alternative Identify and evaluate mitigation strategies Develop priorities for risk mitigation 10 IHS Asset Data and Tools Typical IHS Assets Asset Category 11 Asset Type Roads Pavement Shoulders Structures Bridges Tunnels Culverts/ drainage Noise barrier walls Retaining walls Overhead sign structures High mast light poles Safety Features Pavement markings/ delineators Lighting Guardrails Median barriers Impact attenuators Signs Surveillance/ monitor equip. Signal/control equipment Facilities Rest areas Toll plazas Weigh stations Maintenance depots Pump houses Communication facilities IHS Asset Data and Tools Approach Reviewed available asset data and analytical tools for asset management • Built on work performed previously for NCHRP Project 20-57 Recommended minimum data for IHS asset management Recommended an approach to using readily available analytical tools to support asset management, e.g. • Pavement/bridge management systems • FHWA analysis tools - HERS-ST, NBIAS • AssetManager NT 12 Piloted the approach on 3 IHS corridors IHS Performance Measures Motivation Resource allocation should be guided by a set of policy objectives, performance measures and targets defined for each measure The concepts of performance-based resource allocation are not unique to the IHS What is unique is the practical application of a performance-based approach to the IHS • Criteria for selecting measures • Core versus comprehensive measures • Recommended set of performance measures for the IHS 13 IHS Performance Measures Performance Measure Evaluation Approach Step 1: Review Existing Measures • Perform literature review Step 4: Apply Selection Criteria • Inventory existing measures • Evaluate each measure • Compile list of measures relevant for IHS Asset Management • Group measures by asset/objective • Characterize variations between like measures Step 2: Assess Needs • Evaluate needs for IHS performance measures • Establish performance measure categories • Perform gap assessment • Supplement set of existing measures • Organize measures by category Step 5: Finalize Set of Measures • Develop initial set • Peer review • Develop recommended set Step 3: Define Selection Criteria • Feasibility • Policy-sensitive • Supports long-term view • Useful for decision support • Useful across organization and beyond 14 • Distinguish between core and comprehensive IHS Performance Measures Selecting Suitable Performance Measures Feasibility –calculated from federally-reported data, or other data generally collected for IHS Policy-sensitive – directly related to an agency’s stated policy objectives Long-term and strategic – able to forecast the measure over time and support long-term tracking Understandable – easily understood and communicated within an organization and to external stakeholders Useful for decision making – keeping the set of measures as small as possible 15 IHS Performance Measures Recommended Core Measures Preservation • Pavement − Structural adequacy (combination of riding, rutting, cracking and faulting) − Ride quality (IRI) • Bridge − Percent classified as structurally deficient (SD) – weighted by area • Signs − Percent functioning as intended • Pavement markings − Percent functioning as intended • Guardrail − Percent functioning as intended 16 IHS Performance Measures Recommended Core Measures Mobility and accessibility • Travel time index – ratio of actual travel time to ideal (unconstrained) time • Delay per vehicle (hours per vehicle) Safety • Overall crash rate • Fatal crash rate Environmental • Recommend a report card approach 17 IHS Performance Measures Additional Comprehensive Measures Includes other measures that • Should be collected and reported, but for which data are not consistently available • May or may not be in an asset management program Preservation • Percent functioning as intended for all remaining assets Mobility • Winter maintenance – time to restore pavement surface Delivery 18 • Schedule adherence and cost control Interstate Asset Management Plan Why Have a Plan? Draws attention to importance of the IHS/Function Critical Network Establishes set of performance measures for high-level reporting on interstate assets Relates predicted performance of the IHS to available funds Presents an approach to incorporating risk assessment in decision-making Improves agency accountability 19 Interstate Asset Management Plan Sample Table of Contents I. Significance of the Interstate Highway System II. Assets Included in the Plan III. Measuring Performance IV. Past and Present Funding V. Risk Assessment VI. Interstate Investment Strategy VII. Updating the Plan 20 Next Steps Have completed the final report NCHRP is now preparing the report for publication • Will be published as NCHRP Report 632: An AssetManagement Framework for the Interstate Highway System For more information on NCHRP 20-74 contact: Bill Robert Cambridge Systematics 617-354-0167 [email protected] 21