reston network analysis - existing conditions - stakeholders meeting: nov. 20, 2015
TRANSCRIPT
County of Fairfax, Virginia
Reston Network AnalysisExisting Conditions
Stakeholders MeetingNovember 20, 2015
Kristin CalkinsFairfax County Department of Transportation
County of Fairfax, Virginia
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
County of Fairfax, Virginia
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
County of Fairfax, Virginia
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
Department of Transportation 4
County of Fairfax, Virginia
Study Area
Department of Transportation5
County of Fairfax, Virginia
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
Department of Transportation 6
County of Fairfax, Virginia
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
Department of Transportation 7
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
County of Fairfax, Virginia
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
Department of Transportation9
County of Fairfax, Virginia
Data Needs – 7 Speed Run Routes
Department of Transportation 10
County of Fairfax, Virginia
Department of Transportation
Data Needs – 40 TMC/20 Queue Lengths
County of Fairfax, Virginia
Data Needs – SYNCHRO Network
Department of Transportation12
County of Fairfax, Virginia
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
Department of Transportation 13
County of Fairfax, Virginia
Modeling Flowchart Base ConditionMWCOG 2.3
Fairfax CountyTDM
(Reston Meso
Model VISUM)
UpdateTime
VISSIMSYNCHRO
GIS
Slicing 30 minTAZ Disagg
Department of Transportation 14
County of Fairfax, Virginia
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
County of Fairfax, Virginia
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
Department of Transportation 16
County of Fairfax, Virginia
Land Use & Transportation• Test transportation improvements needed to support the
land use potential approved in the Reston Phase I Comprehensive Plan
Department of Transportation17
County of Fairfax, Virginia
MWCOG Regional Model
TysonsReston
Department of Transportation 18
County of Fairfax, Virginia
Reston VISUM Model
Tysons
Reston
Department of Transportation 19
County of Fairfax, Virginia
TAZ Zonal Split – Block Level
Department of Transportation 20
County of Fairfax, Virginia
TAZ Zonal Split – Driveway Entrances
Department of Transportation21
County of Fairfax, Virginia
Base Calibration Procedure
Network Model
Demand Matrix
Assignment TFlowFuzzy
Count Data
VISSIM
Department of Transportation23
County of Fairfax, Virginia
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
Department of Transportation 24
County of Fairfax, Virginia
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
Department of Transportation25
County of Fairfax, Virginia
VISSIM Results
Department of Transportation 26
County of Fairfax, Virginia
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
Department of Transportation 27
County of Fairfax, Virginia
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
VISSIM Max Queue Field Max Queue Ramp
Length (ft)Vehicles Feet Vehicles Feet
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
Department of Transportation 28
County of Fairfax, Virginia
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
Department of Transportation29
County of Fairfax, Virginia
Dulles Toll Road AM Animation
Department of Transportation 30
County of Fairfax, Virginia
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
Department of Transportation 31
County of Fairfax, Virginia
Dulles Toll Road Exit Ramp Queues5:00 PM – 6:00 PM
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 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
VISSIM Max Queue Field Max Queue Ramp
Length (ft)Vehicles Feet Vehicles Feet
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
Department of Transportation 32
County of Fairfax, Virginia
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
Department of Transportation33
County of Fairfax, Virginia
Dulles Toll Road PM Animation
Department of Transportation 34
County of Fairfax, Virginia
VISUM Results
Department of Transportation35
County of Fairfax, Virginia
Link Base Confidence LevelAM Peak (7:00 – 8:00) Area-wide
Department of Transportation36
County of Fairfax, Virginia
Link Base Confidence LevelPM Peak (5:00 – 6:00) Area-wide
Department of Transportation 37
County of Fairfax, Virginia
Turning Movement Confidence LevelAM Peak (7:00 – 8:00) Area-wide
Department of Transportation38
County of Fairfax, Virginia
Turning Movement Confidence LevelPM Peak (5:00 – 6:00) Area-wide
Department of Transportation39
County of Fairfax, Virginia
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)
Department of Transportation40
County of Fairfax, Virginia
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)
Department of Transportation41
County of Fairfax, Virginia
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)
Field Count (7:00-8:00 AM)Assignment Volumes (7:00-8:00 AM)
Department of Transportation42
County of Fairfax, Virginia
0500
10001500200025003000
Field Count vs. Assigned VolumesSB Fairfax County Pkwy (5:00 -
6:00 PM)
Field Count (5:00 - 6:00 PM)Assignment Volumes (5:00 - 6:00 PM)
Department of Transportation43
County of Fairfax, Virginia
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)
Field Count (7:00-8:00 AM)Assignment Volumes (7:00-8:00 AM)
Department of Transportation44
County of Fairfax, Virginia
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)
Field Count (5:00 - 6:00 PM)Assignment Volumes (5:00 - 6:00 PM)
Department of Transportation45
County of Fairfax, Virginia
Existing Conditions
Department of Transportation46
County of Fairfax, Virginia
Existing Intersection LOSIndividual Movements may have a lower Level of Service
Department of Transportation47
County of Fairfax, Virginia
Existing Intersection LOS (Cont’d)Individual Movements may have a lower Level of Service
Department of Transportation48
County of Fairfax, Virginia
Existing Intersection LOS (Cont’d)Individual Movements may have a lower Level of Service
Department of Transportation49
County of Fairfax, Virginia
Existing Wiehle-Reston East Walkshed
Department of Transportation 50
County of Fairfax, Virginia
Existing Reston Town Center Walkshed
Department of Transportation 51
County of Fairfax, Virginia
Existing Herndon Walkshed
Department of Transportation52
County of Fairfax, Virginia
Existing Reston TSA Walk-shed
Department of Transportation53
County of Fairfax, Virginia
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
Department of Transportation54
County of Fairfax, Virginia
Information Available at Request• 2030 Land use• 2050 Land use• 2050 Grid - # lanes• 2014 Trip Generation• 2030 Trip Generation• 2050 Trip Generation
Department of Transportation55
County of Fairfax, Virginia
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
Department of Transportation 56
County of Fairfax, Virginia
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
Department of Transportation 57
County of Fairfax, Virginia
Schedule
Department of Transportation 58
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
County of Fairfax, Virginia
Questions & Comments
For questions and comments about the study please contact:
Kristin Calkins: [email protected](703) 877-5710
Department of Transportation 59