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Study Context
• Workgroup convened in 2002
• Arlandria Plan adopted in May 2003
• Activities since Plan adoption
• City added implementation of Planto Work Program in June 2009
• Advisory Group formation in Fall2009
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Study Purpose
• Improve safety for all transportation modes
• Develop near- and long-term transportationimprovements
• Provide Arlandria property owners anddevelopers with a guide for futureredevelopment
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Study Area• Focused area within the
Arlandria neighborhood
• Intersections of:
– Mount Vernon Avenue &West Glebe Road
– Mount Vernon Avenue &West Reed Avenue
Mo
unt
Vern
on
Avenu
e
W. Reed Avenue
W. Glebe Road
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Stakeholder Meeting
• March 25, 2009 at the Tenants and WorkersUnited Building
• Input from property owners and neighbors– Transportation concerns/issues
– Redevelopment plans
– Site circulation and access
• Similar feedback to 2003 plan
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Crash History
• 5 years of crash data
• Mount Vernon Avenue andWest Glebe Road– 5 crashes total
– 3 involving pedestrians
• Mount Vernon Avenue andWest Reed Avenue– 24 crashes total
– 4 involving pedestrians or bikes
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Mount Vernon Avenue/West Glebe Road• Existing Conditions
– Skewed geometry
– Pedestrian push button locations
– 27 driveways within500 feet of intersection
– Inconvenient crosswalks
– No bicycle amenities
– Limited transit amenities
– Development pattern
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Mount Vernon Avenue/West Reed Avenue
• Existing Conditions– No crosswalks across
Mount Vernon Avenue
– Driveways do not align withWest Reed Avenue
– Wide travel lanes onMount Vernon Avenue
– Number of crashes
– No transit amenities
– No bicycle amenities
– Development pattern
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Concepts – Guiding Principles
• Resolve existing issues
• Build upon recommendations from the ArlandriaNeighborhood plan
• Consistent with the vision for long-term improvements– Arlandria gateway
– Multimodal transportation accommodation
• Provide short-term improvements supportive of the long-term vision
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Constraints
• Right-of-way
• Existing developmentaccess (driveways)
• Circulation on privateproperty
• Ability to implement
• Cost
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Mount Vernon Avenue/West Glebe Road
• Concept 1 – Roundabout
• Concept 2 – Intersection Realignment
• Concept 3 – Offset Intersections
• Concept 4 – Preferred Concept
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W. Glebe Road
Mount V
ernonAvenue
Concept 1: Roundabout
Cons• Considerable right-of-way impact• Difficult to implement• Requires realignment of either W. Glebe Rd. or Mt.
Vernon Ave.• Would require driveway closures• Turning difficulties for truck traffic• Intersection spacing with W. Reed Avenue• Cost• No dedicated pedestrian crossing signals
Pros•Promotes steady traffic flow
•Manages traffic speed
•Shorter crossing distances forpedestrians
•Provides a gateway
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Concept 2:IntersectionRealignment
W. Glebe Road
Moun
tV
erno
nA
venu
e
Cons
• Significant right-of-way impacts
• Difficult to implement
• Challenging to phase improvements withredevelopment phases
• Cost
Pros
• Reduces/removes skewed geometry
• Reduces pedestrian crossing distances
• Maintains signalized condition
• Improves turning conditions for largevehicles
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Concept 3:OffsetIntersections
W. Glebe Road
Mount V
ernonA
venueV
ern
on
Aven
ue
Mount
Mount
Vern
on
Ave
nue
Cons• Difficult to implement• Significant right-of-way impacts• Interrupts continuity of Mount Vernon Avenue• Increases the number of intersections• Increases traffic on W. Glebe Road• Redevelopment would have to occur in a coordinated
manner• Adds a new traffic signal• Cost
Pros• Creates gateway/destination• Reduces pedestrian crossing distances• Creates two, relatively simple T-
intersections
MountV
ern
on
Ave
nue
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Preferred ConceptMount Vernon Avenue/West Glebe Road
Example of turntreatment inBethesda
Mount V
ernon
Avenue
Glebe Road
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Preferred ConceptBethesda Example
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Preferred ConceptIntersection of Mount Vernon Avenue and West Glebe Road
• Pros– Can be implemented without redevelopment– No additional right-of-way needed– Reduces pedestrian crossing distances– No impacts to existing driveways– Easier northbound and southbound right-turns– “Tightens” intersection geometry– Lower construction cost than other concepts– Multimodal solution
• Cons– Requires traffic signal modifications– Retains skewed intersection geometry
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Mount Vernon Avenue/West Reed Avenue
• Signalization
• Roundabout
• Driveway closure(s)
• Traffic calming measures
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Mount Vernon Avenue/West Reed AvenuePros
• Consistent with small area plan
• Creates a traditional four approachintersection
• Provides crosswalk across Mount VernonAvenue
• Minimizes pedestrian crossing distance
• Driveway consolidation
• Improved transit access
• Opportunity to add bus stop amenities
Cons
• Wachovia site parking lot modifications
Preferred Concept
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Next Steps
• Consensus
• Prepare engineering plans
• Construction
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Questions?
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Thank you!
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