Proposed Street Design Update - VDOT Summer 2015 Repaving Tysons

County of Fairfax, Virginia
Department of Transportation
Proposed Street Design Update
VDOT Summer 2015 Repaving
Tysons
March 16, 2015

2
Overview
• Why are we here?
• What are we asking today?
• What projects are being proposed?
• Where are we in the process?
• What are the next steps?

Why are we here?
• VDOT 2015 Summer repaving includes many streets in Tysons
• Opportunity to improve vehicular safety, improve traffic flow,
improve pedestrian safety, and add bicycle facilities. Implement the
idea of a more walkable/bikeable Tysons today!
• Interim solution until development occurs and streets constructed as
the ultimate sections described in the comprehensive plan
• Low to no cost for the County
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What are we asking today?
• Your input and feedback
– Support, questions, concerns, ideas
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Photo Credit:
sundaystreetssf.com

Project List
–Road Diet
• Greensboro Drive
• Tyco Road
• Westbranch Drive
–Climbing Lane
• Jones Branch Drive
• Westbranch Drive
• Park Run Drive
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Project List (continued)
–Sharrows
• Spring Hill Road
– Small section with bike lanes
• Westwood Center Drive
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Proposed Network
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Road Diets
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Road Diets
• Removing travel lanes from a roadway and reallocating
the space for other uses
• Rule of thumb: Streets with less than 20,000
vehicles per day don’t need four travel lanes
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Street Name Current Traffic Volume
Greensboro Dr. 7,800 vehicles per day
Tyco Rd. 4,900 vehicles per day
Westbranch Dr. 2,700 vehicles per day

48’
12’ 12’ 12’ 12’
48’
12’ 12’ 6’6’ 12’
EXISTING PROPOSED

Road Diet Advantages
• Improved safety and mobility for cyclists and pedestrians
• Reduction in fastest speeds
• 20% to 50% crash reduction

In existing conditions, if a driver moves slightly over the double yellow line there
is a risk for a head-on crash. In the proposed design, center turn lanes provide a
buffer from oncoming traffic.
Existing Proposed

Existing Proposed
In existing conditions, if a driver swerves slightly to the right, there is a risk for a
collision with the curb. In the proposed design, bikes lanes provide buffer from
curb, although the bike lane shouldn’t be regularly used by drivers.

Existing Proposed
In existing conditions, if a driver pulls over with disabled vehicle, there is a risk
of being in a rear-end collision. In the proposed design, bike lane can provide
safe area during emergency conditions, and help to avoid a rear-end collision.

Existing Proposed
In existing conditions, if a driver is waiting for traffic to clear to make a left turn,
there is a risk of a rear-end collision. In the proposed design, left turn lanes
provide dedicated space to make turn, out of the way of through traffic.

Existing Proposed
In existing conditions, if two drivers are making left turns, they block each others
sight distance and view of oncoming traffic. In the proposed design, turn lanes
provide better sight lines and view of oncoming traffic.

Existing
In existing conditions, the sight lines for drivers exiting side streets can make it
difficult to see oncoming traffic. In the proposed design, the through lane is away
from the curb, and a driver has a better view of oncoming vehicles.

County of Fairfax, VirginiaLawyers Rd Road Diet

Lawyers Rd Road Diet Results
• Average speeds dropped by 1 mph
• Vehicles over 50 mph declined from 13% to 1% of traffic
• No change in traffic volume

0
5
10
15
20
25
Year 5 Year 4 Year 3 Year 2 Year 1 Year 1 Year 2 Year 3 Year 4 Year 5
Crashesperyear
Property Damage
Injury
Crashes in the Road Diet Section of Lawyers Rd.
B E F O R E A F T E R
Average 16 total crashes per year
Average 6 injury crashes per year
5 crashes per year
67%
A F T E R

Lawyers Road Survey
• 851 responses, non-scientific, one year after implementation
• Does the road feel safer?
• Do you cycle more often on Lawyers?
• Do your auto trips take more time?
• Have auto speeds dropped?
• Did the project improve Lawyers?
Yes: 69%
Yes: 47%
No: 69%
Yes: 59%
Yes: 74%

Greensboro Drive
• Spring Hill Drive to Solutions Drive
• ADT – 7,800
• Increased safety for drivers, people walking, and
people on bikes
• No change to intersection
lane configuration
• Minimal impact to LOS
• Solutions Dr to International
Dr proposed with sharrows
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Greensboro Drive (continued)
• Discussed proposal with representatives from the
Rotonda Community
• Heard about about concerns with their entrance and
bus stops
• Proposing different cross section at entrance to
accommodate concerns
• Evaluating option to move bus stop to far side of
entrance
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Tyco Road
• Low ADT- 4900
• Connection to Route 7
and Spring Hill Metro
• Increased safety for all
road users
• No change to intersection lane
configuration = no negative impact to LOS
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Westbranch Drive
• Low ADT – 2700
• Improve safety for all road users
• Extend network from future bike
improvements related to Arbor Row
development
• Buffered bike lanes
– High level of comfort
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Westbranch Drive
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Before After

Lane Diet with Climbing Lanes
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Jones Branch Dr /Westpark Dr /
Park Run Drive
• Need to maintain 5 lanes: Existing width
approximately 60’
• Proposed Climbing Lane: 5’ Bike Lane with
11’ travel lanes
• Bike Lane in uphill direction
• Shared lane downhill direction
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Jones Branch Dr /Westpark Dr /
Park Run Drive
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Jones Branch Drive
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Bike Lane
Bike Lane
Sharrows
Sharrows

Westpark Drive
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Bike Lane
Sharrows
Sharrows
Sharrows

Park Run Drive Option A
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Bike Lane
Sharrows

Park Run Drive Option B
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- 1 SB bike lane
- 1 SB car lane
- 1 LT lane
- 2 NB lanes
- 1 NB bike lane
- 1 SB bike lane
- 2 SB car lanes
- 1 LT lane
- 2 NB car lanes
- 1 NB bike lane
Analyzing traffic data. Climbing lane
or bike lanes to intersection

Sharrows
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Westwood Center Drive
• Low ADT and narrow cross-section
• Low speed
• Not wide enough
for bike lanes
• Sharrows
recommended
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Spring Hill Road
• Sharrows where there is a median, bike
lanes where there isn’t
• Sharrows require no
change to existing lane
configuration
• Bike lanes added by
narrowing lanes, not
removing any lanes
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ci.santa-rosa.ca.us

Lane Diet with Bike Lanes
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Spring Hill Road
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Bike Lanes
Sharrows
Sharrows

Future Traffic Analysis
• Development proposals included in analysis
– Solutions Plaza/SAIC (Westpark Dr/Greensboro Dr/Rt. 7)
– Greensboro Park Place (International Drive/Greensboro Drive)
– Georgelas (Greensboro Drive/Spring Hill Rd/Tyco Road)
– 7915 Jones Branch Drive (Jones Branch Dr/Westpark Dr)
– Arbor Row (Westpark Dr/Jones Branch Dr/Westbranch Dr)
• Added in future trips from these developments to
existing traffic counts
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Future Traffic Analysis
• Grid of streets helps to displace trips throughout
network
• No significant degrading of level of service at
intersections
– Keeping the same lane configuration for most intersection
approaches
• Developments will build out ultimate cross section
approved in Tysons Plans
– 4 lanes, bike lanes, and parking/circulator
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Proposed Network
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• People who ride bikes spend money
• Multiple studies have shown a connection between
bicycle infrastructure and economic growth
– Portland State study found people who ride bikes spent
$106/month vs $79/month by drivers at convenience stores
• Spend less on transportation, have more to spend on
other goods and services
• NYC study showed that sales for businesses next to a
protected bike lane increased 49%, while the rest of
Manhattan only saw an 3% increase in sales1
1 http://www.nyc.gov/html/dot/downloads/pdf/dot-economic-benefits-of-sustainable-streets.pdf
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Bikes mean Business

Bikes mean Business
• Companies/Businesses want to attract young, new talent
– Denver Downtown Partnership said #1 demand from tech
companies is bicycle lanes
• Bike facilities outside the door of
an apartment/office is a selling point
• Goldman Sachs study found that
30% of Millenials do not intend to
purchase a car in the near future
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Where are we in the Process?
• Conceptual design complete
• Traffic analysis completed to verify
minimal change in delay at intersections
• Public outreach and comment period
– Comment period open until April 1, 2015
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What are the next steps?
• Review public comments and redesign
plans as necessary
• Design completion: April 2015
• Projects go to construction Summer 2015
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Thank You
Questions/Comments?
adam.lind@fairfaxcounty.gov
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Proposed Street Design Update - VDOT Summer 2015 Repaving Tysons

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Proposed Street Design Update - VDOT Summer 2015 Repaving Tysons