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US 29 / 15/ 17 Interchange StudyFauquier County, Virginia
March 8, 2013
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PROJECT HISTORYUS 29 / 15 / 17 Interchang
Page 1
This interchange study explores the feasibility of
constructing an interchange at the existing at-grade
intersection of Route 29/15/17 with Business Route29/15/17 & Lord Fairfax Road just at the southern edge
of the Town of Warrenton in Fauquier County.
Route 29 is a major north-south route in Virginia
spanning 248 miles from the North Carolina State Line in
Danville to the Key Bridge in Washington D.C. The
portion from Danville to Warrenton is known as the
Seminole Trail. Through the project areas, US 29 is co-located with US Route 15 and US Route 17.
Route 29 is a principal arterial. South of the project
intersection, Route 29 is four-lane highway with at-grade
intersections. North of the project intersection, Route
29 is a limited access bypass of Warrenton with grade
separations. Business Route 29 is classified as a minorarterial while Lord Fairfax Way is not federally classified
and thus a local road.
Existing Intersection
Project
Area
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PROJECT HISTORYUS 29 / 15 / 17 Interchang
Page 2
When the Route 29 Bypass was constructed in the early
1980s, an interchange was explored at this intersection.
Several designs were considered including a full
cloverleaf and Route 29 on new alignment.
However, ultimately a trumpet interchange design was
chosen and limited access right-of-way was acquired in
the 1990s.
1980s Original Interchange
Concepts
1980s Design Plans for a Trumpet
Interchange
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PROJECT HISTORYPREVIOUS ALTERNATIVESUS 29 / 15 / 17 Interchang
Page 3
Recently VDOT explored several preliminary interchange alternatives for this
intersection utilizing the existing right-of-way as much as possible. Four distinct
alternatives were developed and compared.
Alternative 1 Alternative 2
Alternative 3
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PROJECT HISTORYPREVIOUS ALTERNATIVESUS 29 / 15 / 17 Interchang
Page 4
Comparison
MatrixAlternative 4
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EXISTING 2009 TRAFFIC CONDITIONSUS 29 / 15 / 17 Interchang
Page 5
21
1198
470
10
17
5
39
45
860
41
165
27
AM PEAK HOUR N
1689
C
32
944
23314
895
293
39
44
16
60
73
1413
77
637
40
1202
E
1546
754
PM PEAK HOUR
James Madison Hwy
Easte
rnBypass
JamesMa
disonHwy
Lord Fairfax Rd (Route 880) James Madison Hwy
Easte
rnBypass
JamesMa
disonHwy
Lord Fairfax Rd
F
F EC
D BC
C
E
E
F
E
D
D
D
D
D
D
D
D BC
C
E
E
D
D
DB C
C
Business Business
LEGEND: Volume Level of Service233 C
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Traffic volumes for design year 2040 were developed by
applying historic trend growth rates to existing counts and
adding additional traffic associated with the planned ArringtonProperty Development.
FUTURE GROWTHUS 29 / 15 / 17 Interchang
Page 6
Route 2010VPD
2040VPD
%Trucks
US 15-17-29 43,400 74,100 9%
US 15-17-29 Bypass 39,700 68,100 9%
Bus 15-17-29 10,500 15,700 2%
Route 880 3,100 19,300 6%
2040 Design Year Volumes
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FUTURE 2040 NO-BUILD TRAFFIC CONDITIONSUS 29 / 15 / 17 Interchang
Page 7
192
1838
721
35
95
50366
80
1527
66
267
251
2751
F
180
1973
584
James Madison Hwy
Easte
rnBypass
JamesMa
disonHwy
Lord Fairfax Rd (Route 880)
AM PEAK HOUR N
41
1373
449
150
315
258190
130
2509
124
1029
120
F
1863
F
1546
1273
PM PEAK HOU
James Madison Hwy
JamesMa
disonHwy
Lord Fairfax Rd
F
F
F
F
F
F
E D B
FFC
D
F
F
FF
EF F B
F
D
D
E E
FFC
F
Business Business
LEGEND: Volume Level of Service233 C
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PRELIMINARY ALTERNATIVES ELIMINATEDUS 29 / 15 / 17 Interchang
Page 8
Based on the previous VDOT developed alternatives and consideration for the future traffic demand, Baker devel
five preliminary interchange concepts for the project.
Three of the five alternatives were eliminated from further consideration and two advanced for further study.
three eliminated include:
1. Mainline Bridges Alternative
Eliminated from further study
Left hand exit does not meet driver
expectations and could result in safety issues.
Most expensive alternative
Requires significant amount of retaining walls
Requires design exception for vertical grades
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PRELIMINARY ALTERNATIVES ELIMINATEDUS 29 / 15 / 17 Interchang
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2. Partial Cloverleaf Alternative
( loops to the South)
Eliminated from further study
Least amount of storage for heaviest turn
movement (NB to WB left)
Still requires a traffic signal
Requires most right-of-way
Tight SB loop off-ramp < 25 mph
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PRELIMINARY ALTERNATIVES ELIMINATEDUS 29 / 15 / 17 Interchang
Page 10
3. Partial Cloverleaf Alternative
( loops to the North)
Eliminated from further study
NB to EB movement could block loop ramp
which carries the heaviest turn movement (NB
to WB left)
Still requires a traffic signal
Tight NB loop off-ramp < 25 mph
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Page 11
PRELIMINARY ALTERNATIVES CARRIED FORWARDUS 29 / 15 / 17 Interchang
Diamond Interchange Alternative
This Interchange Study carried two alternatives forward for further study. For each alternative concept
geometric layout, operational functionality, right-of-way impacts, constructability, and costs were analyzed.
The concepts were re-designed to carry the 2040 forecast traffic volumes for the project area. The cross-streeta design speed of >=40 mph and the ramps a design speed of >= 25 mph.
The two preliminary alternatives carried forward are:
Roundabout Interchange Alternative
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DIAMOND INTERCHANGE CONCEPTUS 29 / 15 / 17 Interchang
Page 12
The Diamond Interchan
Concept consists of:
Removing the existinggrade signalized inter
Carrying Lord Fairfax
over Route 29 Bypass
six-lane bridge.
Four ramps with RoutBypass.
Signalized intersectio
either side of the cro
bridge at the ramp te
5-foot sidewalk on no
of interchange.
2011 Project Costs
PE:
RW:
CONST:
TOTAL:
2,000,000
100,000
24,000,000
26,100,000
Diamond Interchange
Concept
Curb and gutter
Landscaped Median
Bridge
Road Improvements
Existing ROW
ROW Acquisition
Sidewalk
Potential SWM Pond
Legend
Pavement Demolition
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DIAMOND INTERCHANGE CONCEPTUS 29 / 15 / 17 Interchang
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The Diamond Interchange Concept
the following operational character
Ramp termini will need to be sign
by opening day.
The western Ramp termini inters
is expected to operate at LOS B o
better for both AM and PM peak
The eastern Ramp Termini Intersis expected to operate at LOS C o
better for both AM and PM peak
Ramp junctions with Route 29 By
expected expected to operate at
or better for AM peak hour and L
or better for PM peak hour with design volumes.
Diamond Interchange
Concept
Curb and gutter
Landscaped Median
Bridge
Road Improvements
Existing ROW
ROW Acquisition
Sidewalk
Potential SWM Pond
Guardrail
Legend
Pavement Demolition
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DIAMOND INTERCHANGE - RIGHT OF WAY NEEDSUS 29 / 15 / 17 Interchang
Page 14
The Diamond Interchan
Concept requires 1.98 aright-of-way:
Right-of-way based on
Fauquier County GIS d
Retaining walls may b
to reduce acquisition
Construction easemen
could be used instead
ROW acquisition for d
roads during construcDiamond Interchange
ConceptExisting ROW
ROW Acquisition
Legend
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ElevationLooking North
DIAMOND INTERCHANGEBRIDGE DETAILSUS 29 / 15 / 17 Interchang
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Typical Section - Looking East
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DIAMOND INTERCHANGE - CONSTRUCTABILITYUS 29 / 15 / 17 Interchang
Page 16
Bridge Construction
Road Construction
SWM Pond Construction
Legend
Temporary Pavement Phase 1
Construction
Phase 1 Construction:
Maintain all traffic movements at existing signalized intersection.
Divert WB Business Route 29/15/17 traffic to EB Business Route 29/15/17.
Construct Bridge & SWM Ponds. Construct Westbound Lord Fairfax Road and WB Business Route 29/15/17.
Construct SB off-ramp & NB on-ramp and a portion of the NB off-ramp & SB on-ramp.
Lord Fairfax Rd.
James Madison Hwy
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DIAMOND INTERCHANGE - CONSTRUCTABILITYUS 29 / 15 / 17 Interchang
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Road Construction
SWM Pond Construction
Legend
Phase 1 Construction
Temporary Pavement
Phase 2Construction
Phase 2 Construction:
Divert EB Business Route 29/15/17 traffic to WB Business Route 29/15/17.
Divert EB Lord Fairfax Rd traffic to WB Lord Fairfax Road & utilize SB off-ramp & NB on-ramp
Maintain WB to SB left turn movement at existing signalized intersection.
Detour NB to WB and NB to EB traffic onto Lord Fairfax Rd prior to project area.
Detour SB on-ramp traffic using temporary pavement.
Construct SB on-ramp and a portion of EB Business Route 29/15/17.
Lord Fairfax Rd.
James Madison Hwy
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DIAMOND INTERCHANGE - CONSTRUCTABILITYUS 29 / 15 / 17 Interchang
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Road Construction
SWM Pond Construction
Legend
Phase 1 & 2 Construction
Temporary PavementPhase 3
Construction
Phase 3 Construction:
Divert EB Business Route 29/15/17 traffic to WB Business Route 29/15/17.
Divert EB Lord Fairfax Rd traffic to WB Lord Fairfax Road &
utilize SB off-ramp, NB on-ramp & SB on-ramp
Detour NB to WB and NB to EB traffic onto Lord Fairfax Rd prior to project area. Construct final portion of NB off-ramp and a portion of EB Business Route 29/15/17.
Enlarge SWM pond.
Lord Fairfax Rd.
James Madison Hwy
DIAMOND INTERCHANGE COST ESTIMATE
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DIAMOND INTERCHANGECOST ESTIMATEUS 29 / 15 / 17 Interchang
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Assumptions
VDOT Culpepper District Average Unit Costs 2009-20
Bridge Costs = $250 SF
Pavement Section: 2.0 Surface Coarse + 4.0
Intermediate Coarse + 7.0 Base Mix + 8.0 Subbase
Aggregate.
Miscellaneous 20%
Contingency 10%
ROW Costs = 140% of assessed land value +$15,000
admin fees per parcel.
Utility Adjustments minimal project passes over w
line and gas line easement as does the existing road
Cost Estimate
Roadway & Drainage Costs: $ 9,500,000
Bridge Costs: $ 4,800,000
Miscellaneous (20%): $ 2,850,000
Contingency (10%): $ 1,450,000
Mobilization/Survey/MOT: $ 2,400,000
Base Estimate for Construction: $ 21,000,000
Right-of-way/Utilities: $ 200,000
Construction Engineering (15.5%): $ 2,900,000
Preliminary Engineering: $ 2,000,000
TOTAL PROJECT COSTS: $ 26,100,000
ROUNDABOUT INTERCHANGE CONCEPT
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ROUNDABOUT INTERCHANGE CONCEPTUS 29 / 15 / 17 Interchang
Page 20
The Roundabout Interc
Concept consists of:
Removing the existinggrade signalized inter
Carrying Lord Fairfax
over Route 29 Bypass
three-lane bridge.
Four ramps with Rout
Bypass.
Roundabouts on eith
of the cross street br
the ramp termini.
Multi-use Path on no
of interchange.
2011 Project Costs
PE:
RW:
CONST:
TOTAL:
2,000,000
100,000
22,500,000
24,600,000
Roundabout InterchangeConcept
Curb and gutter
Landscaped Median
Bridge
Road Improvements
Existing ROW
ROW Acquisition
Sidewalk
Potential SWM Pond
Guardrail
Legend
Pavement Demolition
ROUNDABOUT INTERCHANGE CONCEPT
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ROUNDABOUT INTERCHANGE CONCEPTUS 29 / 15 / 17 Interchang
Page 21
Roundabout InterchangeConcept
Curb and gutter
Landscaped Median
Bridge
Road Improvements
Existing ROW
ROW Acquisition
Sidewalk
Potential SWM Pond
Guardrail
Legend
Pavement Demolition
The Roundabout Interch
Concept has the followin
operational characteristi
Ramp termini intersec
expected to operate at
or better for AM peak
and LOS C or better fo
peak hour with 2040 d
volumes.
Ramp junctions with R
29 Bypass expected ex
to operate at LOS C or
for AM peak hour and
or better for PM peak
with 2040 design volum
ROUNDABOUT INTERCHANGE RIGHT OF WAY NEEDS
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ROUNDABOUT INTERCHANGE RIGHT OF WAY NEEDSUS 29 / 15 / 17 Interchang
Page 22
The Roundabout Interch
Concept requires 1.98 aright-of-way:
Right-of-way based on
Fauquier County GIS d
Retaining walls may b
to reduce acquisition
Construction easemen
could be used instead
ROW acquisition for d
roads during construcRoundabout Interchange
ConceptExisting ROW
ROW Acquisition
Legend
ROUNDABOUT INTERCHANGE BRIDGE DETAILS
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ROUNDABOUT INTERCHANGEBRIDGE DETAILSUS 29 / 15 / 17 Interchang
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ElevationLooking North
Typical Section - Looking East
ROUNDABOUT INTERCHANGE CONSTRUCTABILITY
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ROUNDABOUT INTERCHANGE - CONSTRUCTABILITYUS 29 / 15 / 17 Interchang
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Bridge Construction
Road Construction
SWM Pond Construction
Legend
Temporary PavementPhase 1
Construction
Phase 1 Construction:
Maintain all traffic movements at existing signalized intersection.
Divert WB Business Route 29/15/17 traffic to EB Business Route 29/15/17.
Construct Bridge & SWM Ponds.
Construct Westbound Lord Fairfax Road and WB Business Route 29/15/17.
Construct SB off-ramp & NB on-ramp and a portion of the NB off-ramp & SB on-ramp.
Construct north half of both roundabouts
James Madison Hwy
Lord Fairfax Rd.
ROUNDABOUT INTERCHANGE CONSTRUCTABILITY
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ROUNDABOUT INTERCHANGE - CONSTRUCTABILITYUS 29 / 15 / 17 Interchang
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Road Construction
SWM Pond Construction
Legend
Phase 1 Construction
Temporary Pavement
Phase 2Construction
Phase 2 Construction:
Divert EB Business Route 29/15/17 traffic to WB Business Route 29/15/17.
Divert EB Lord Fairfax Rd traffic to WB Lord Fairfax Road & utilize north side of roundabouts
Maintain WB to SB left turn movement at existing signalized intersection.
Detour NB to WB and NB to EB traffic onto Lord Fairfax Rd prior to project area.
Detour SB on-ramp traffic using temporary pavement & utilize NB on-ramp and SB off-ramp.
Construct SB on-ramp, a portion of EB Business Route 29/15/17 including finishing west roundabout.
James Madison Hwy
Lord Fairfax Rd.
ROUNDABOUT INTERCHANGE - CONSTRUCTABILITY
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ROUNDABOUT INTERCHANGE - CONSTRUCTABILITYUS 29 / 15 / 17 Interchang
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Road Construction
SWM Pond Construction
Legend
Phase 1 & 2 Construction
Temporary PavementPhase 3
Construction
Phase 3 Construction:
Divert EB Business Route 29/15/17 traffic to WB Business Route 29/15/17.
Divert EB Lord Fairfax Rd traffic to WB Lord Fairfax Road & utilize SB off-ramp, NB on-ramp & SB on-
ramp.
Detour NB to WB and NB to EB traffic onto Lord Fairfax Rd prior to project area. Construct final portion of NB off-ramp including finishing east side roundabout and a portion of EB
Business Route 29/15/17. Enlarge SWM pond.
James Madison Hwy
Lord Fairfax Rd.
ROUNDABOUT INTERCHANGE COST ESTIMATE
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ROUNDABOUT INTERCHANGE COST ESTIMATEUS 29 / 15 / 17 Interchang
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Assumptions
VDOT Culpepper District Average Unit Costs 2009-20
Bridge Costs = $250 SF
Pavement Section: 2.0 Surface Coarse + 4.0
Intermediate Coarse + 7.0 Base Mix + 8.0 Subbase
Aggregate.
Miscellaneous 20%
Contingency 10%
ROW Costs = 140% of assessed land value +$15,000
admin fees per parcel.
Utility Adjustments minimal project passes over w
line and gas line easement as does the existing road
Cost Estimate
Roadway & Drainage Costs: $ 9,500,000
Bridge Costs: $ 3,800,000
Miscellaneous (20%): $ 2,650,000
Contingency (10%): $ 1,350,000
Mobilization/Survey/MOT: $ 2,400,000
Base Estimate for Construction: $ 19,700,000
Right-of-way/Utilities: $ 200,000
Construction Engineering (15.5%): $ 2,700,000
Preliminary Engineering: $ 2,000,000
TOTAL PROJECT COSTS: $ 24,600,000