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June 13, 2007

Access Management Program. June 13, 2007. 4.1. 2.8. 2.1. 1.7. 1.3. 1. Schedule. NHCRP Report 420 - Impacts of Access Management Techniques. Composite Crash Rate Indices. 5. 4. 3. Crash Rate Index. 2. 1. 0. 10. 20. 30. 40. 50. 60. Access Points per Mile.

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June 13, 2007

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  1. Access Management Program June 13, 2007

  2. 4.1 2.8 2.1 1.7 1.3 1 Schedule NHCRP Report 420 - Impacts of Access Management Techniques Composite Crash Rate Indices 5 4 3 Crash Rate Index 2 1 0 10 20 30 40 50 60 Access Points per Mile Source: NHCRP Report 420, TRB 1999

  3. Design Team Responsibilities • Create a consensus regarding design elements for the access management program. • Ensure that Districts have input • Provide recommendations to the State Engineer -3-

  4. Internal Policy No prescribed legal standards ADOT Staff ADOT consultants No 3rd Parties, No appeals ADOT final say Not enforceable Arizona Administrative Code Meets prescribed legal standards 3rd Parties (public) The weight of Law Subject to legal review Enforceable May be appealed The Roadway Design Guide and other ADOT guides and policies are not regulatoryRDGPermit Rules

  5. Roadway design Guidance (mostly) Relies on Professional Engineering judgment No enforcement needed Entirely ADOT discretion. Little judgment Little flexibility Clear, concise Enforceable Applies only to access decisions RDG - Permit Rule

  6. What are the legal issues to ensure design strength and permit enforcement ? • Access permitting regulates property rights • Permit requirements must be regulatory • Only by weight of law can ADOT have enforcement powers • ADOT must meet established legal standards for Rule format, language, clarity. • Rule must be understandable to those whom do business with ADOT (the public)

  7. Access Classification System • Sets the system hierarchy • The access classification determines the answer to the questions: - May I have access to the state highway? - Where should the access be located? - What type of access may I have? - What are the major design elements?

  8. Access Category Assignment Status

  9. Access Category Design Issues • Standards for granting or denying access requests. • Spacing of intersections & signals. • Volume warrants for turn lanes

  10. Suggested turn volume warrants for turn lane

  11. Rule Level Access Design Elements • If the request qualifies for highway access, what will ADOT require? • Which design elements must be in Regulation to provide enforcement “teeth” • Which permit elements are expensive • What can be left in the various ADOT ‘internal’ policies and guides?

  12. Rule Level Access Design Elements • Access Spacing (location) • Sight distance requirements • Turn Lane design (decel, Accel & storage lengths) • Driveway Geometrics • Medians (type, when open) • Legal Enforcement of design permit terms and condition

  13. Rule Level Access Design Elements • Selection of the Design Vehicle • Drainage (retention, MS4, system design) • Cattle guards, gates & location • Emergency access only. • Earthwork (side slopes, specs, erosion) • Design Variances • Exception and Waiver Procedures

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