Access Management Program
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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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June 13 2007

  • Access Management Program

June 13, 2007


Nhcrp report 420 impacts of access management techniques

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


Design team responsibilities

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-


The roadway design guide and other adot guides and policies are not regulatory rdg permit rules

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


Rdg permit rule

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


What are the legal issues to ensure design strength and permit enforcement

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)


June 13 2007

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?


Access category assignment status

Access Category Assignment Status


June 13 2007

Access Category Design Issues

  • Standards for granting or denying access requests.

  • Spacing of intersections & signals.

  • Volume warrants for turn lanes


Suggested turn volume warrants for turn lane

Suggested turn volume warrants for turn lane


June 13 2007

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?


June 13 2007

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


Rule level access design elements

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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