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Project For Transportation Reform Lunch


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  • 1. Florida Green Book & New TND Street Design Chapter
    Billy Hattaway, PE, CNU
  • 2. “The Perfect Storm”
    • Federal Highway Trust Fund – in the red as of September 2008.
    • 3. State transportation revenues also in big trouble….FDOT deferred $7 billion in projects
    • 4. Climate change
    • 5. Development on hold
  • “The solution of the traffic problem is to be sought not so much by wider streets as by proper plan of the town.”
    John Nolen, 1926
  • 6. AASHTO “Green book”
    • Adopted by state DOT’s
    • 7. Reflects consensus of states on what constitutes good design practice
    • 8. Never intended to be used solely as a standard to base the design of every improvement on
  • 9. Flexibility in Highway Design - FHWA
    • “… functional classification establishes the basic roadway cross section in terms of:
    • 10. lane width
    • 11. shoulder width and other major design features…”
    • 12. “The flexibility available to a highway designer is considerably limited once a particular functional classification has been established.”
  • FDOT Plans Preparation Manual
    Based on AASHTO criteria
    • Florida roadways – focus on:
    • 13. Higher speeds
    • 14. Highway capacity
    • 15. Functional classification
    • 16. Rural & suburban
  • A Typical State Arterial Highway
    Miami, Fl
  • 17. FDOT “Green Book”
    “Manual of Uniform Minimum Standards for the Design, Construction and Maintenance for Streets and Highways”
    • Where does it apply?
    • 18. Local roads
  • FDOT “Green Book”
    • Based on AASHTO “minimums”
    • 19. County & City Roads – focus on:
    • 20. Highway capacity
    • 21. Functional classification
    • 22. Rural & suburban development
    • 23. Traffic calming & Residential Street (suburban) chapters added
  • TND Chapter
    • Why is this chapter being included?
    • 24. Local governments want to encourage TND development patterns
    • 25. Context is needed to define when TND street design criteria is appropriate
    • 26. Criteria will reduce liability for all parties
  • Green Book Project Goals
    • “Traditional” and “Conventional” character defined anddifferentiated
    • 27. Context and character for use of Traditional street design defined
  • TND Chapter Content
    AIntroduction – TNDvs CSD
    BPlanning Criteria – Guiding principles
    C Context – The Transect
    DDefinitions – Teaching engineers a new language
    ELand Use – Can’t get there without it
    FNetworks – Power of the network
    GThoroughfare Types – Functional class vs Movement
    HDesign Principles – Guiding principles
    ICross Section Elements – Defining the pieces
    JTravelled Way - Designing the street
    KIntersections - Focused on pedestrians
  • 28. The Context
  • 29. Size neighborhoods for a 5-minute walk
  • 30. Make blocks a walkablesize:
    A fine grained network of streets & ammenities
    Neighborhood Centers
    Parks and Open Spaces
    Civic Buildings
  • 31. Lane Width
    • The normal range of design lane width is 9-12’
    • 32. Wider lanes are associated with higher speed roadways
  • Lane Width
    • There is less direct evidence of a safety benefit associated with wider lanes in urban areas.
    • 33. Lane widths substantially less than 12 feet are considered adequate for a wide range of volume, speed and other conditions.
  • Driver Expectation
  • 34. Design Speed
    • Conventional practice is to design as high a speed as possible
    • Traditional practice is to design for the context and speed desired to support other modes
  • Design Speed
    • Design speed is a selected speed used to establish geometric features of the street
    • Using the built environment to send the driver a clear message on how fast to drive
  • Pedestrian Fatalities & Speed
  • 35.
  • 36. Lane Width:
  • 37. Clear Zone:
    • An obstacle free area that permits the driver to safely return to the roadway or bring the vehicle to a safe controlled stop
    • 38. Speed determines how much
  • Clear Zone
  • 39. Horizontal
  • 40. Horizontal Clearance
    • The focus of urban streets is provision for:
    • 41. Pedestrians
    • 42. Street furniture
    • 43. Landscaping
    • 44. In urban areas, 1.5’ minimum is for operational needs (car door conflicts), not safety.
  • “Barrier Curb”
    Curb has no re-directional capabilities except at speeds less than the lowest design speeds used on the State Highway System.
  • 45. Intersections
    • Driving through intersections is one of the most complex conditions drivers encounter
    • 46. 50 percent of fatal and non-fatal injuries to pedestrians occur at or near intersections
  • Conflicts at a Four-Way Intersection
  • 47. Intersection Safety
  • Typical State Road Intersection
  • 52.
  • 53.
  • 54.
  • 55. Florida Green Book & New Urban Street Design
    Billy Hattaway, PE, CNU
    Phone: 407.704.0782