Transcript Document

Access
Management
Program
June 13, 2007
NHCRP Report
420 - Impacts of
Schedule
Access Management Techniques
Crash Rate Index
Composite Crash Rate Indices
5
4.1
4
3
2
1
1.3
10
20
1.7
2.1
2.8
1
0
30
40
50
Access Points per Mile
Source: NHCRP Report 420, TRB 1999
60
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
• Internal Policy
• No prescribed legal
standards
• ADOT Staff
• ADOT consultants
• No 3rd Parties, No
appeals
• ADOT final say
• Not enforceable
Permit Rules
• Arizona
Administrative Code
• Meets prescribed
legal standards
• 3rd Parties (public)
• The weight of Law
• Subject to legal
review
• Enforceable
• May be appealed
RDG
-
• Roadway design
Guidance (mostly)
• Relies on Professional
Engineering judgment
• No enforcement
needed
• Entirely ADOT
discretion.
Permit Rule
•
•
•
•
•
Little judgment
Little flexibility
Clear, concise
Enforceable
Applies only to
access decisions
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)
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
Arizona State Highway
(Draft) Access Management Categories
FW (freeway)
MR (major regional)
RA (rural principal)
RB (rural secondary)
UA (urban principal)
UB (urban mixed)
UC (urban secondary)
SF (service and frontage roads)
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
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?
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
• 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