Reston Network Analysis - Existing Conditions - Stakeholders Meeting: Nov. 20, 2015

County of Fairfax, Virginia

Reston Network AnalysisExisting Conditions

Stakeholders MeetingNovember 20, 2015

Kristin CalkinsFairfax County Department of Transportation


Agenda• Project Overview• Overview of Modeling Process

– Data Collection– Modeling Methodology– Analysis and Results

• Existing Conditions

• 2050 & 2030 Trip Reductions

• 2050 Model Runs

• Next Steps

• Questions And Answers

Department of Transportation 2


Reston Transportation RecommendationsImprovements from Reston Phase I Plan Amendment

• An Enhanced Street Network to increase connectivity• Three additional Toll Road Crossings

– Town Center Parkway Underpass – Soapstone Drive Overpass– South Lakes Drive Overpass

• Grade Separate Fairfax County Parkway/Sunrise Valley Drive

Department of Transportation3


Enhanced Street Network• Maintains a balance between land use and transportation• Provide alternate routes through the TSAs for all modes• Ensures pedestrian mobility & connectivity throughout

the Transit Station Areas (TSAs)• Provides connectivity for bikes• Support bus service to Metrorail• Strengthened by a strong Transportation Demand

Management (TDM) program in the TSAs



Study Area



Purpose of Study• Conduct a detailed analysis of the grid of streets to

determine:– Signal Control– Number of lanes between and at intersections– How to best serve pedestrians, bikes and transit– Right-of-way needs

• Assign urban street types and modal emphasis based on Department of Rail and Public Transportation Multimodal System Design Guidelines

• Conduct a phasing analysis of when larger projects are needed



Reston Network Analysis Tasks1. Data Collection – done2. Existing Conditions – being finalized3. Future Conditions – coordination beginning

– Determine Grid of Streets

4. Phasing Analysis 5. DRPT Classifications6. Specific location improvements for additional study

– Reston Parkway– Sunrise Valley Drive @ Fairfax County Parkway– Spring Street @ Fairfax County Parkway– Rock Hill Road Bridge


Data Collection• Traffic

Counts in June 2015

• Travel Time Runs

Existing Conditions• Cap

acity Analysis

• Level of Service

Test Grid of Streets (2030 & 2050)• Traffic

Forecasting Capacity Analysis

• Level of Service

Mitigation• Signal

re-timing

• New links

• Turn lanes

• Additional lanes

Roadway Classification• DRPT

Design Guidelines• B

ike lanes

• Sidewalks/ Pedestrian routes

• On-Street Parking

• Transit Routes

Finalize Grid of Streets (2030 & 2050) Based on:• Advis

ory Group input

• Stakeholder input

• Community input

Phasing Analysis• Priori

tization of larger projects

Network Analysis Project Process

Advisory Group input, Stakeholder input, Community input


Data Needs• Completed

– Intersections Turning Movement Counts (TMCs)– Intersections for Queue Measurement– Speed Run Routes– Synchro input and output files– Driveway Locations– Future Grid of Street Plans

• Future– Mitigation Plans



Data Needs – 7 Speed Run Routes



Department of Transportation

Data Needs – 40 TMC/20 Queue Lengths


Data Needs – SYNCHRO Network



Data Inputs to VISUM Model Process• MWCOG / Fairfax County Models• GIS Layers (Traffic Analysis Zones; Parcels;

Aerial Imagery)• Traffic Counts (Freeways & Arterials)• Other Available Traffic Counts• Traffic Signal Timings• SYNCHRO for Signal Optimization



Modeling Flowchart Base ConditionMWCOG 2.3

Fairfax CountyTDM

(Reston Meso

Model VISUM)

UpdateTime

VISSIMSYNCHRO

GIS

Slicing 30 minTAZ Disagg



Department of Transportation

Modeling Flowchart Future Condition

UpdateTime

MWCOG 2.3

Fairfax CountyTDM

)

Slicing 30 minTAZ Disagg

ITE TGTOD credit

Land Use

(Reston Meso

Model VISUM)

VISSIMSYNCHRO

GIS


Methodology• County Model

– Seed trip tables• VISUM

– Model development at mesoscopic (local roadway system & driveway ) level.

• VISUM model input– Traffic volumes and O-D trip tables– SYNCHRO for signal timing optimization

• VISUM model output– Seamlessly translated to the VISSIM simulation model at the

microscopic (roadway intersection) level.• VISSIM model – DTR Only

– Microscopic analyses – adds intersection and driveway level details



Land Use & Transportation• Test transportation improvements needed to support the

land use potential approved in the Reston Phase I Comprehensive Plan



MWCOG Regional Model

TysonsReston



Reston VISUM Model

Tysons

Reston



TAZ Zonal Split – Block Level



TAZ Zonal Split – Driveway Entrances



Base Calibration Procedure

Network Model

Demand Matrix

Assignment TFlowFuzzy

Count Data

VISSIM



Calibration Parameter/Procedure• VISUM/VISSIM

– Field Observed Volume– Field Observed Queue– Field Observed Corridor Travel Time

• VISSIM (DTR only)– VDOT Traffic Operation Tool Guidebook– Formula– Number of Model Runs– Confidence Level– Tolerance Level



Analysis and Results• Measure of Effectiveness (MOE) from VISSIM

– Field Observed vs. Model Volume– Field Observed vs. Model Queue– Field Observed vs. Model Corridor Travel Time

• Measure of Effectiveness (MOE) from VISUM– Network Wide R2 Value– Field Observed vs. Model Volume– Intersection LOS



VISSIM Results



Dulles Toll Road AM Mainline Volumes

7:00-8:00 6:00-9:000

1000200030004000500060007000

WB DTR Mainline east of Route 28 split

Field Vissim

7:00-8:00 6:00-9:000

2000400060008000

100001200014000

WB DTR Mainline east of Hunter Mill Road off ramp

Field Vissim

7:00-8:00 6:00-9:000

5000

10000

15000

20000

EB DTR Mainline east of Route 28/Airport merge

Field Vissim

7:00-8:00 6:00-9:000

5000

10000

15000

20000

25000

EB DTR Mainline east of Hunter Mill Road on ramp

Field Vissim



Dulles Toll Road Exit Ramp Queues7:00 AM – 8:00 AM

ID Westbound Exit Ramp VISSIMVolume

FieldVolume GEH

VISSIM Max Queue Field Max Queue Ramp

Length (ft)Vehicles Feet Vehicles Feet

2 Centreville Road & DTR WB ramps 703 700 0.1 12 298 15 375 1460

16 Fairfax County Parkway & WB DTR ramps

552 575 1.0 7 167 6 150 1315

27 Reston Parkway & WB DTR ramps 717 815 3.5 8 190 7 175 1700

36 Wiehle Avenue & WB DTR ramps 312 405 4.9 8 195 9 225 1175

40 Hunter Mill Road & WB DTR ramps 354 360 0.3 11 251 8 200 1520

ID Eastbound Exit Ramp VISSIMVolume

FieldVolume GEH



3 Centreville Road & DTR EB ramps 397 450 2.6 12 282 11 275 1515

17 Fairfax County Parkway & EB DTR ramps

919 875 1.5 22 539 9 225 1230

28 Reston Parkway & EB DTR ramps 521 540 0.8 10 240 5 125 1160

37 Wiehle Avenue & EB DTR ramps 680 535 5.9 14 332 17 425 850

41 Hunter Mill Road & EB DTR ramps 355 360 0.3 15 352 5 125 975



Dulles Toll Road AM Travel Times

Direction Field VISSIM DifferenceWestbound 06:33 05:44 -00:49

Eastbound 08:32 08:30 00:03

Centreville Road – Hunter Mill Road



Dulles Toll Road AM Animation



Dulles Toll Road PM Mainline Volumes

17:00-18:00 16:00-19:000

5000

10000

15000

20000

WB DTR Mainline east of Route 28 split

Field Vissim

17:00-18:00 16:00-19:000

5000

10000

15000

20000

25000

WB DTR Mainline east of Hunter Mill Road off ramp

Field Vissim

17:00-18:00 16:00-19:000

2000

4000

6000

8000

10000

EB DTR Mainline east of Route 28/Airport merge

Field Vissim

17:00-18:00 16:00-19:000

2000400060008000

100001200014000

EB DTR Mainline east of Hunter Mill Road on ramp

Field Vissim



Dulles Toll Road Exit Ramp Queues5:00 PM – 6:00 PM

ID Westbound Exit Ramp VISSIMVolume

FieldVolume GEH



2 Centreville Road & DTR WB ramps 976 1055 2.5 29 721 16 400 1460

16 Fairfax County Parkway & WB DTR ramps

1172 1215 1.2 19 465 13 325 1315

27 Reston Parkway & WB DTR ramps 522 815 11.3 14 336 9 225 1700

36 Wiehle Avenue & WB DTR ramps 540 580 1.7 9 222 11 275 1175

40 Hunter Mill Road & WB DTR ramps 486 570 3.7 25 618 24 600 1520

ID Eastbound Exit Ramp VISSIMVolume

FieldVolume GEH



3 Centreville Road & DTR EB ramps 228 310 5.0 9 222 12 300 1515

17 Fairfax County Parkway & EB DTR ramps

630 675 1.8 34 834 10 250 1230

28 Reston Parkway & EB DTR ramps 461 500 1.8 17 403 5 125 1160

37 Wiehle Avenue & EB DTR ramps 218 150 5.0 7 164 7 175 850

41 Hunter Mill Road & EB DTR ramps 342 430 4.5 23 563 6 150 975



Dulles Toll Road PM Travel Times

Direction Field VISSIM DifferenceWestbound 07:00 7:24 00:24

Eastbound 05:26 05:49 00:23

Centreville Road – Hunter Mill Road



Dulles Toll Road PM Animation



VISUM Results



Link Base Confidence LevelAM Peak (7:00 – 8:00) Area-wide



Link Base Confidence LevelPM Peak (5:00 – 6:00) Area-wide



Turning Movement Confidence LevelAM Peak (7:00 – 8:00) Area-wide



Turning Movement Confidence LevelPM Peak (5:00 – 6:00) Area-wide



0

4000

8000

12000

Field Count vs. Assigned Vol-umes

EB DTR Mainline & Ramps (7:00 - 8:00 AM)

Field Count (7:00-8:00 AM)Assignment Volumes (7:00-8:00 AM)



DTR Eas

t of H

unter

Mill

Rd

DTR WB to

Wieh

le Ave

Wiehle

Ave to

DTR W

B

DTR WB to

Res

ton P

kwy

Reston

Pkw

y to W

B DTR

DTR WB to

Fairfax

Cou

nty P

kwy

Fairfax

Cou

nty P

kwy t

o WB D

TR

DTR WB to

Cen

trevil

le Rd

Centre

ville

Rd to D

TR WB

DTR WB ju

st ea

st of

Rt28/R

t267 s

plit

0100020003000400050006000700080009000

10000

Field Count vs. Assigned VolumesWB DTR Mainline & Ramps (5:00 -

6:00 PM)

Field Count (5:00 - 6:00 PM)Assignment Volumes (5:00 - 6:00 PM)



Fox M

ill Roa

d

Sunris

e Vall

ey D

rive

South

of DTR E

B Ram

ps

Betwee

n DTR R

amps

North o

f DTR W

B Ram

ps

Ramp t

o Spri

ng S

treet

New D

omini

on P

arkway

Baron C

amero

n Ave

nue

0

500

1000

1500

2000

2500

3000

Field Count vs. Assigned VolumesNB Fairfax County Pkwy (7:00 -

8:00 AM)




0500

10001500200025003000

Field Count vs. Assigned VolumesSB Fairfax County Pkwy (5:00 -

6:00 PM)




McLea

ren R

oad/L

awye

rs Roa

d

Fox M

ill Roa

d

Glade D

rive

South

Lake

s Driv

e

Sunris

e Vall

ey D

rive

South

of DTR E

B Ram

ps

Betwee

n DTR R

amps

North o

f DTR W

B Ram

ps

Bluemon

t Way

New D

omini

on P

arkway

/Tempo

rary R

oad

Baron C

amero

n Ave

nue

0

500

1000

1500

2000

2500

Field Count vs. Assigned VolumesNB Reston Pkwy (7:00 - 8:00 AM)




Baron C

amero

n Ave

nue

New D

omini

on P

arkway

/Tempo

rary R

oad

Bluemon

t Way

Reston

Pkw

y SB - N

orth o

f DTR W

B Ram

ps

Reston

Pkw

y SB - b

etwee

n DTR R

amps

Reston

Pkw

y SB - S

outh

of DTR E

B Ram

ps

Sunris

e Vall

ey D

rive

South

Lake

s Driv

e

Glade D

rive

Fox M

ill Roa

d

McLea

ren R

oad/L

awye

rs Roa

d0

500

1000

1500

2000

2500

3000

3500

Field Count vs. Assigned VolumesSB Reston Pkwy (5:00 - 6:00 PM)




Existing Conditions



Existing Intersection LOSIndividual Movements may have a lower Level of Service



Existing Intersection LOS (Cont’d)Individual Movements may have a lower Level of Service



Existing Wiehle-Reston East Walkshed



Existing Reston Town Center Walkshed



Existing Herndon Walkshed



Existing Reston TSA Walk-shed



DevelopmentPeak Hour – Future Trips

0-1/4 Mile ¼ to ½ MileBeyond ½

Mile

2030 2050 2030 2050 2030 2050

Office 40% 45% 35% 40% 30% 35%

Residential 40% 45% 35% 40% 20% 25%

Technological Advancement for all Trips

- 7.5% - 7.5% - 7.5%

TDM Vehicle Trip Reduction Goals

Reductions based off of ITE Trip Generation Rates



Information Available at Request• 2030 Land use• 2050 Land use• 2050 Grid - # lanes• 2014 Trip Generation• 2030 Trip Generation• 2050 Trip Generation



2050 Model Runs• Test 2050 Comp Plan Build Out• Mitigation Measures - Tiered Approach

• No right of way impact – Trip Re-assignment– Optimize Signal Timing and Phasing– Modify the Lane Configuration– Evaluate 4-way Stop vs. 2-way Stop– Traffic Signal Addition

• Some right of way impact– Turn lanes– Additional through lane– Additional grid link

• Large scale mitigations if needed– Discussion with Advisory Group and Stakeholders Group



Next Steps• 2030 Model Runs • DRPT Guidelines Roadway Classification• Phasing Analysis• Reston Comprehensive Plan Amendment

• If needed to integrate finalized grid of streets• Four Specific Study Locations

• Reston Parkway• Fairfax County Parkway at Spring Street • Fairfax County Parkway at Sunrise Valley Drive• Rock Hill Bridge



Schedule


Task Description

1A Land Use and Networks - Task is Complete

1B Traffic Counts - Task is Complete

2A Establish Existing Conditions - Task is Complete

2B Calibrate Against Existing Conditions - Task is Complete

3A2 Analyze Future Conditions (2050)

3A1 Analyze Future Conditions (2030)

3B Simulation of the Dulles Toll Road

3C Microsimulation - Optional

4A Meetings/Presentations

5A Phasing Analysis - Existing Conditions

5B Phasing Analysis - 2050 - Optional

6 Determination of DRPT Guidelines Roadway Classification

7 Documentation

8 Reston Parkway Capacity Improvements

9 Fairfax County Parkway & Spring Street Interchange

10 Fairfax County Parkway & Sunrise Valley Drive

11 Rock Hill Bridge at Sunrise Valley Drive

12A Meetings/Presentations

Feb-15May-15 Jun-15 Jul-15 Aug-15 Sep-15 Oct-15 Nov-15 Dec-15 Jan-16 Sep-16 Oct-16Mar-16 Apr-16 May-16 Jun-16 Jul-16 Aug-16

11/17/15


Questions & Comments

For questions and comments about the study please contact:

Kristin Calkins: [email protected](703) 877-5710


Reston Network Analysis - Existing Conditions - Stakeholders Meeting: Nov. 20, 2015

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