Proposed interchange at Rt. 29 and Lord Fairfax Dr

7/28/2019 Proposed interchange at Rt. 29 and Lord Fairfax Dr.

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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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Page 9

2. Partial Cloverleaf Alternative

( loops to the South)


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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Page 10

3. Partial Cloverleaf Alternative

( loops to the North)


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

Page 13

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

Page 15

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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Page 17

Road Construction


Legend

Phase 1 Construction

Temporary Pavement

Phase 2Construction


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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Page 18

Road Construction


Legend

Phase 1 & 2 Construction

Temporary PavementPhase 3

Construction



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

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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

Page 24

Bridge Construction

Road Construction


Legend


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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Page 25

Road Construction


Legend

Phase 1 Construction

Temporary Pavement

Phase 2Construction



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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Page 26

Road Construction


Legend

Phase 1 & 2 Construction


Construction



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

Page 27

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

Documents

Proposed interchange at Rt. 29 and Lord Fairfax Dr