County Road Administration Board Transportation System Preservation (part 1)
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Transcript of County Road Administration Board Transportation System Preservation (part 1)
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Washington StateTransportation Commission
March 20, 2007
Jeff Monsen, PEIntergovernmental Policy Manager
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Discuss relationships between components of the transportation system
Discuss factors that lead to county roadway management decisions
Discuss transportation Cooperation / Coordination / Competition
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RCW 36.78
CRAB Mission: To preserve and enhance the
transportation infrastructure of Washington State Counties by providing
standards of good practice, fair administration of funding programs,
leadership, and progressive and professional technical services.
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System element differences Jurisdictions - Local / State / Port /
Tribal / Federal / Private / etc Magnitude of use
System element similarities Users Travel modes Need for inter-connection
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How people see the system
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Jurisdiction
Lane Miles Daily Vehicle Miles Traveled
State 20,003 86,222,000
County 80,396 23,444,000
City 34,728 40,972,000
Other 36,156 1,479,000
(Lane Miles by Jurisdiction - 2007 WTP)
How people use the system
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Surface / Structural / Functional conditions
Roadway capacity Minimum tolerable condition Pavement types (PCC/ACP/BST/GRV) Routes / Routing / Corridors Safety (engineering, education,
enforcement) “Level of Service”
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Jurisdictions with the largest component of statewide system
Significant amount of rural (low volume) roadways, critical to resource and agriculture industries
Provides significant ‘alternate’ routes for state highway system
Only travel option for many users
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Urban Collector / Arterial
1,917
Urban local access 4,333Rural Collector / Arterial
12,587
Rural local access 21,030
Total (centerline miles)
39,867
(22% of system has travel lane widths of 9-ft or less)
County Road SystemCenterline Miles (2005)
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Portland Cement 127Asphalt 8,455BST 17,215Gravel 11,845Dirt 2,225
Total (centerline miles)
39,867
County Road SystemPavement Type (2005)
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Roadway use and capacityPavement management decision-
makingSafety issuesMulti-modal demandsFinancial capacity (base funding
and predicted grant revenues)
Local level of service decisions
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Driving Surface
Leveling Layer (s)
Foundation – Imported Base Material
Foundation – On-site Material (graded and compacted)Underlying Ground (undisturbed)
Typical Roadway Structure (presence of layers and their thicknesses vary)
When is a road all-weather?
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Excellent(89-100)
Good(68-88)
Fair(49-67)
Poor(21-48)
Failed(0-20)
5 10 2015
Years
Preventative
Corrective Measures
Reconstruction Measures
Pave
men
t Con
ditio
n R
atin
g
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Pavement Management Decision Tree
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Operational differences between jurisdictions (scale, scope, and sophistication)
Multi-model demands, services, and interconnection
Environmental mitigation and restoration
Transportation through: Coordination / Cooperation / Competition
Compromise required due to the increasing disparity between financial capacity and level of service preferences
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Contact and information:
Jeff Monsen, PEIntergovernmental Policy ManagerCounty Road Administration Board
(360) 753-5989E-Mail: [email protected]