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Performance measurement

Performance measurement. Motivation. Federal regulation Intermodal surface transportation efficiency act of 1999 (ISTEA) Transportation equity act for the 21 st century (TEA-21) Constraining funding resources Roles of transportation for non-transportation related objectives

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Performance measurement

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  1. Performance measurement

  2. Motivation • Federal regulation • Intermodal surface transportation efficiency act of 1999 (ISTEA) • Transportation equity act for the 21st century (TEA-21) • Constraining funding resources • Roles of transportation for non-transportation related objectives • Need for policy/technology evaluation

  3. Potential benefits • Better direction of the resources to programs and projects • Need to prioritize projects at the state and local level • Improved correlation between agency goals and those desired by users and general public • Improved accountability • More informed decision

  4. Broad categories of goals

  5. Definitions • Goal: a general statement of a desired state or ideal function of a transportation system • Objective: a concrete step toward achieving a goal, stated in measurable terms. • Performance measure: a measurable term used to achieve the objective.

  6. Performance measures • At the system level • At the project level

  7. What you choose as performance measures influences the types of projects you will choose

  8. Dimensions of performance measure • Goals and objectives • Sector • Mode • Perspective • Spatial scope • Level of agency responsibility • Time frame • Intended use

  9. What is a good performance measure? • Appropriateness: corresponds to at least one goal/objective • Measurability: can be measured with available data and resources • Dimensionality: should capture required dimensions • Realistic: if requires data collection, it should be feasible • Defensible: easy interpretation for communication • Forecastable: can be forecasted for the future using available data and resources

  10. Performance measures tell nothing about the causal factors

  11. Effect of speed hump

  12. adjusted treatment effect = (crashesat – crashesbt) – (crashesac – crashesbc)

  13. Examples http://shrp2webtool.camsys.com/Default.aspx

  14. If you can teleport yourself instantaneously between home and school, what would be your ideal commute time? __________ minutes

  15. Which choice would you choose? • Choice 1: guaranteed that it takes 40 minutes to get to work. • Choice 2: 60% of the chance that it will take 20 minutes and 40% of the chance that it will take 70 minutes.

  16. Summary Results (percentage of crash change) Number in bold means the reduction is significant at 5% level; NA means the results are unavailable due to small sample sizes.

  17. Summary Results (percentage of crash change) Number in bold means the reduction is significant at 5% level; NA means the results are unavailable due to small sample sizes.

  18. Data needs and analysis requirements • Your ideal performance measures may not have readily available data to support them • You may have to settle on less than ideal performance measures that do have available data • And sometimes, the modeling requirements are too high

  19. Typically available data sources • Survey data • Household travel surveys • Workplace surveys • Hotel surveys • Transit on-board surveys • Truck surveys • External station surveys • Parking surveys

  20. Typically available data sources • Traffic monitoring • Vehicle volume counters • Vehicle classification recorders • Weight in motion

  21. Typically available data sources • Customer satisfaction and perception data • Highway performance monitoring data

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