cobb county comprehensive transportation plan (ctp) board of commissioners briefing january 22, 2008
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Cobb County Comprehensive Transportation Plan
Purpose of CTP
• Identifies multimodal transportation needs countywide
• Recommendations include roadway, freight, transit, bicycle and pedestrian solutions
• Compares needs against funding assumptions to develop strategic vision for implementation
• Serves as a transportation planning “platform” upon which future detailed project concept development efforts will build
Cobb County Comprehensive Transportation Plan
Study Background
• 2-year effort
• Interjurisdictional, including Cobb’s unincorporated areas and 6 municipalities
• Analysis reported for 4 Planning Areas encompassing entire county
• 2 primary study parts: Transportation elements of DCA Comprehensive Plans and enhanced countywide multimodal recommendations
Cobb County Comprehensive Transportation Plan
Coordination and Outreach• Project Management Team (PMT)
– Representatives from County, cities, ARC and GDOT
– 12 meetings over the course of the study
• Stakeholder Coordinating Committee (SCC)
– Representatives from public agencies and private organizations
– Appointed by each County Commissioner and municipality
– 7 meetings (3/06, 6/06, 9/06, 1/07, 5/07, 8/07, 10/07)
• Cobb Paulding Working Group (CPWG)
– Specific focus on traffic within western Cobb and Paulding County impact
– Representatives selected by Cobb County, Paulding County and the City of Marietta
– 6 meetings (10/06, 1/07, 5/07, 8/07, 10/07, 12/07)
• Special briefings conducted for municipalities and CIDs as requested throughout study duration
Cobb County Comprehensive Transportation Plan
Public Involvement• Public involvement meetings
– 5 rounds (4/06, 8/06, 2/07, 10-11/07, 1/08)
– 628 attendees from first 4 rounds
• Study website (www.cobbdot.org/ctp)
• Newsletters (4)
• Fact sheets, press releases and meeting flyers
• Stakeholder interviews (52 community leaders)
• Surveys (1000 random phone interviews)
• Contact database (600)
Cobb County Comprehensive Transportation Plan
Technical Process
• Accepted methodologies and analyses used to ensure compatibility with regional planning processes
• Regional model adapted to provide greater Cobb specific detail on travel patterns and volumes
• Cost estimates and funding assumptions based on local, regional and state sources and tools
Cobb County Comprehensive Transportation Plan
Recommendations• Multimodal Projects
– Roadway
– Transit
– Multi use trails
– Pedestrian facilities
• Policies and Procedures
– Roadway
– Access management
– Freight truck routes
– Travel demand management (TDM)
– Bicycle, pedestrian and multi use trail facilities
Cobb County Comprehensive Transportation Plan
Factors Considered in Project Selection
• Congestion
– Overcapacity
– Daily Delay
– Travel Time Index (TTI)
• Safety
• Thoroughfare Plan Classification
• Capital/Operating Costs per Rider
• Potential Community and Economic Impacts
Cobb County Comprehensive Transportation Plan
Roadway Improvements
• 137 total
– Widenings = 50
– New roadways, extensions/connectors = 9
– Operational (access management, shoulder widening, corridor improvements) = 30
– Major intersection improvements (grade separation, realignment, new interchange) = 28
– Operational intersection improvements = 36
*Some projects include two types of improvements (e.g., widening and major intersection improvements)
Cobb County Comprehensive Transportation Plan
Transit Improvements
• 17 total
– US 41 high capacity transit (feasibility study)
– Express bus service = 5
– Limited stop bus service = 5
– Local bus service = 3
– Circulator shuttle service = 3
Cobb County Comprehensive Transportation Plan
Trail & Pedestrian Improvements
• Multi use trails = 44 total (~168 linear miles)
• Pedestrian facilities = 80 total (~ 41 linear miles)
– Safety & key corridor = 34
– LCI connectivity = 11
– School/activity center buffer = 35
• Assume roadway improvements will incorporate bicycle/pedestrian facilities and trail connections as appropriate
Cobb County Comprehensive Transportation Plan
Recommendations by Planning Area
Project TypeNorthwest(Acworth & Kennesaw)
NortheastSoutheast(Marietta &
Smyrna)
Southwest (Austell & Powder
Springs)
Roadway 40 42 43 30
Transit 8 5 7 6
Trail 9 5 20 18
Pedestrian 14 6 32 34
TOTAL 71 58 102 88
*Some projects are included in more than one Planning Area
Cobb County Comprehensive Transportation Plan
System Performance Results
Performance Measure
Base ScenariosNeeds Based
Plan2005 2030 E+C
Travel Time Index 1.43 1.73 1.55
>6 Hrs of Congestion(% of Lane-Miles)
1% 5% 2%
2-6 Hrs of Congestion% of Lane-Miles)
18% 27% 20%
<2 Hrs of Congestion(% of Lane-Miles)
81% 68% 77%
Annual Congestion Cost(x $1,000,000)
$870.1 $1,908 $1,515
Transit Mode Share 0.6% 0.7% 1.2%
Cobb County Comprehensive Transportation Plan
Access Management Policies• Continued adherence to development standards
• Formation of access review committee
• Completion of corridor specific access management plans, beginning with arterials
• Required access management plan as part of concept development process for arterial and major collector widenings and upgrades
• Access Management Overlay Districts (AMODs)
• Appropriate access management applications based upon functional classification typology
Cobb County Comprehensive Transportation Plan
Truck Freight Policies
• Land use compatibility
• Operations and design
• Maintenance
• Intermodal facilities
Cobb County Comprehensive Transportation Plan
Travel Demand Management Policies
• TMA expansion and development
• Required TDM plans for new large land developments
• CIDs critical to TDM implementation
Cobb County Comprehensive Transportation Plan
Bicycle, Pedestrian & Trail Policies• Strategically target investments to most suitable areas
• Require roadway projects to include pedestrian and bicycle facilities as appropriate
• Update zoning code to require pedestrian and bicycle facilities and amenities in commercial and mixed use developments
• Establish guidelines for ensuring connectivity between neighborhoods and adjacent land uses
• Promote education, enforcement and awareness programs to encourage increased use of and safety for bicycling and walking
Cobb County Comprehensive Transportation Plan
Estimated Costs by Category• Roadway = $4,504,029,000
– On System Improvements = $3,532,576,000
– Off System Improvements = $971,453,000
– Capacity Improvements = $3,274,872,000
– Major Intersection Improvements = $798,344,000
– Operational Improvements = $430,813,000
• Transit = $1,132,803,000 (Capital & Operating)
• Multi Use Trails = $168,856,000
• Pedestrian = $38,603,000
– Safety & key corridor = $18,103,000
– LCI connectivity = $7,330,000
– School & activity center buffer = $13,170,000
Cobb County Comprehensive Transportation Plan
Use of Plan into the Future
• To move specific transportation projects forward (prioritization, funding, detailed concept definition)
• For project inclusion in ARC’s Regional Transportation Plan (must be drawn from and supported by the countywide CTP)
• As a staff resource during interjurisdictional and intercounty coordination efforts
• To ensure land use / transportation connectivity and shifting travel behaviors are monitored by Plan updates (every 3-5 years)
Cobb County Comprehensive Transportation Plan
Upcoming Outreach
• Draft CTP summary and document placed on website from January 23 for public download, review and comment
• Final Public Involvement Meeting on January 24 from 3:30-7:30 PM at Central Marietta Library
• CTP presentations to local municipality Mayors/Councils for appropriate action
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