Traffic Engineering Technical Report Addendum

198 Pages·2009·19.27 MB·English

Traffic Engineering
Technical Report
Addendum

Prepared by

October 2009

TABLE OF CONTENTS
Section 1 Introduction.....................................................................................................................1-1
ONE
1.1 Report Organization.................................................................................1-4
Section 2 Methodologies................................................................................................................2-1
2.1 Managed Lane Forecasting......................................................................2-1
2.1.1 Traffic Forecast Adjustments.......................................................2-2
2.2 Transit Ridership Forecasting..................................................................2-3
2.3 Freeway Mainline and Ramp Analysis....................................................2-3
2.3.1 Development of Service Flow Rate Volumes..............................2-4
2.3.2 Peak-Hour Factor.........................................................................2-4
2.3.3 Heavy Vehicle Factor..................................................................2-6
2.4 Intersection Analysis................................................................................2-6
2.5 VISSIM Analysis.....................................................................................2-8
2.5.1 Roadway Network Assumptions..................................................2-9
2.5.2 Analysis Criteria..........................................................................2-9
Section 3 US 36 Mainline Analysis.................................................................................................3-1
3.1 Mainline Geometry..................................................................................3-1
3.2 Managed Lane Analysis...........................................................................3-2
3.2.1 Type of Separation From General-Purpose Lanes.......................3-3
3.2.2 Managed Lane Access.................................................................3-4
3.2.3 Vissim Analysis Results..............................................................3-5
3.3 Mainline Volumes....................................................................................3-6
3.4 Mainline Level of Service......................................................................3-12
Section 4 Interchange Design Concepts, Impacts, and Mitigation.............................................4-1
4.1 Interstate 25/Broadway Interchange Complex.........................................4-1
4.1.1 Interchange Volume.....................................................................4-4
4.1.2 Operations Summary...................................................................4-9
4.1.3 Transportation Impacts Summary..............................................4-10
4.2 Pecos Street Interchange........................................................................4-10
4.2.1 Interchange Volumes.................................................................4-10
4.2.2 Operations Summary.................................................................4-15
4.2.3 Transportation Impacts Summary..............................................4-16
4.3 Federal Boulevard Interchange..............................................................4-16
4.3.1 Interchange Volumes.................................................................4-18
4.3.2 Operations Summary.................................................................4-18
4.3.3 Transportation Impacts Summary..............................................4-23
4.4 Sheridan Boulevard Interchange............................................................4-23
4.4.1 Interchange Volumes.................................................................4-24
4.4.2 Operations Summary.................................................................4-24
4.4.3 Transportation Impact Summary...............................................4-30
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4.5 Church Ranch Boulevard Interchange...................................................4-31
4.5.1 Interchange Volumes.................................................................4-31
4.5.2 Operations Summary.................................................................4-36
4.5.3 Transportation Impacts Summary..............................................4-37
4.6 Wadsworth Parkway/120th Avenue Interchange....................................4-37
4.6.1 Interchange Volumes.................................................................4-42
4.6.2 Operations Summary.................................................................4-42
4.6.3 Transportation Impacts Summary..............................................4-44
4.6.4 Design of the Wadsworth Parkway/120th Avenue
Intersection.................................................................................4-44
4.7 Interlocken/Flatiron Interchange Complex............................................4-45
4.7.1 Interchange Volumes.................................................................4-50
4.7.2 Operations Summary.................................................................4-50
4.7.3 Transportation Impacts Summary..............................................4-52
4.8 Mccaslin Boulevard Interchange...........................................................4-52
4.8.1 Interchange Volumes.................................................................4-52
4.8.2 Operations Summary.................................................................4-57
4.8.3 Transportation Impacts Summary..............................................4-58
4.9 Foothills Parkway/Table Mesa Drive Interchange................................4-58
4.9.1 Interchange Volumes.................................................................4-59
4.9.2 Operations Summary.................................................................4-64
4.9.3 Transportation Impacts Summary..............................................4-65
Section 5 Transit Ridership and Station Areas.............................................................................5-1
5.1 Transit Ridership Forecasts......................................................................5-1
5.1.1 Transit Station Boardings............................................................5-1
5.2 Station Area Access.................................................................................5-3
5.2.1 Station Access Analysis Methodology........................................5-3
5.3 Station Access Level of Service..............................................................5-4
Section 6 References......................................................................................................................6-1

TABLES
Table 2.3-1: Freeway Level of Service Versus Service Flow Rate (65 miles per hour Free
Flow Speed).....................................................................................................................2-4
Table 2.4-1: Level of Service Thresholds....................................................................................2-6
Table 3.1-1: US 36 Number of Lanes..........................................................................................3-2
Table 3.2-1: Assessment of Bus Rapid Transit/High-Occupancy Vehicle Lane Separation
Options.............................................................................................................................3-4
Table 3.2-2: Average Speeds within Each Analysis Location.....................................................3-5
Table 3.3-1: Existing (2003) US 36 Traffic Volumes................................................................3-7
Table 3.4-1: US 36 Mainline Segments Level of Service.........................................................3-13
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Table 4.1-1: Broadway Interchange Area Peak-Hour Level of Service......................................4-9
Table 4.2-1: Pecos Street Interchange Area Peak-Hour Level of Service.................................4-15
Table 4.3-1: Federal Boulevard Interchange Area Peak-Hour Level of Service.......................4-22
Table 4.4-1: Sheridan Boulevard Interchange Area Peak-Hour Level of Service.....................4-29
Table 4.5-1: Church Ranch Boulevard Interchange Area Peak-Hour Level of Service............4-36
Table 4.6-1: Wadsworth Parkway/120th Avenue Interchange Area Peak-Hour Level
of Service.......................................................................................................................4-42
Table 4.7-1: Interlocken Loop Interchange Area Peak-Hour Level of Service.........................4-50
Table 4.8-1: McCaslin Boulevard Interchange Peak-Hour Level of Service............................4-57
Table 4.9-1: Foothills Parkway/Table Mesa Drive Interchange Peak-Hour Level
of Service.......................................................................................................................4-64
Table 5.1-1: Project Area Daily Transit Ridership......................................................................5-1
Table 5.1-2: Weekday Bus Rapid Transit and Rail Daily Boardings (Year 2035)......................5-2
Table 5.3-1: Station Access Intersection Level of Service..........................................................5-5

FIGURES
Figure 1.1-1: US 36 Study Area..................................................................................................1-2
Figure 1.1-2: Combined Alternative Package (Preferred Alternative) Typical
Cross-Sections..................................................................................................................1-3
Figure 2.3-1: Typical Roadway Congestion Levels for Each LOS Grade..................................2-5
Figure 3.3-1: Existing Weekday Hourly Distribution of US 36 Traffic at 112th Avenue
(Between Broomfield and Church Ranch Boulevard).....................................................3-8
Figure 3.3-2: 2035 Daily Corridor Traffic Volumes...................................................................3-9
Figure 3.3-3: 2035 A.M. Peak-Hour Corridor Traffic Volumes................................................3-10
Figure 3.3-4: P.M. Peak-Hour Corridor Traffic Volumes.........................................................3-11
Figure 4.1-1: US 36 Interchange Locations.................................................................................4-2
Figure 4.1-2: Broadway Interchange Combined Alternative Package (Preferred Alternative)
Configuration...................................................................................................................4-3
Figure 4.1-3: US 36/I-25 Interchange Combined Alternative Package (Preferred Alternative)
Configuration...................................................................................................................4-5
Figure 4.1-4: Broadway Interchange Existing Volumes, Geometry, and Level of Service........4-6
Figure 4.1-5: Broadway Interchange 2035 No Action Volumes, Geometry, and Level
of Service.........................................................................................................................4-7
Figure 4.1-6: Broadway Interchange Combined Alternative Package (Preferred Alternative)
Volumes, Geometry, and Level of Service......................................................................4-8
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Figure 4.2-1: Pecos Street Interchange Proposed Configuration...............................................4-11
Figure 4.2-2: Pecos Street Interchange Existing Volumes, Geometry, and Level of
Service............................................................................................................................4-12
Figure 4.2-3: Pecos Street Interchange 2035 No Action Volumes, Geometry, and Level of
Service............................................................................................................................4-13
Figure 4.2-4: Pecos Street Interchange2035 Combined Alternative Package (Preferred
Alternative) Existing Volumes, Geometry, and Level of Service.................................4-14
Figure 4.3-1: Federal Boulevard Interchange Combined Alternative Package (Preferred
Alternative) Configuration.............................................................................................4-17
Figure 4.3-2: Federal Boulevard Interchange Existing Volumes, Geometry, and Level
of Service.......................................................................................................................4-19
Figure 4.3-3: Federal Boulevard Interchange 2035 No Action Volumes, Geometry, and
Level of Service.............................................................................................................4-20
Figure 4.3-4: Federal Boulevard 2035 Combined Alternative Package (Preferred Alternative)
Volumes, Geometry, and Level of Service....................................................................4-21
Figure 4.4-1: Sheridan Boulevard Interchange Combined Alternative Package (Preferred
Alternative) Configuration.............................................................................................4-25
Figure 4.4-2: Sheridan Boulevard Interchange Existing Volumes, Geometry, and Level of
Service............................................................................................................................4-26
Figure 4.4-3: Sheridan Boulevard Interchange 2035 No Action Volumes, Geometry, and
Level of Service.............................................................................................................4-27
Figure 4.4-4: Sheridan Boulevard Interchange 2035 Combined Alternative Package
(Preferred Alternative) Volumes, Geometry, and Level of Service..............................4-28
Figure 4.5-1: Church Ranch Boulevard Interchange Combined Alternative Package
(Preferred Alternative) Configuration............................................................................4-32
Figure 4.5-2: Church Ranch Boulevard Interchange Existing Volumes, Geometry, and
Level of Service.............................................................................................................4-33
Figure 4.5-3: Church Ranch Boulevard Interchange 2035 No Action Volumes, Geometry,
and Level of Service......................................................................................................4-34
Figure 4.5-4: Church Ranch Boulevard Interchange 2035 Combined Alternative Package
(Preferred Alternative) Volumes, Geometry, and Level of Service..............................4-35
Figure 4.6-1: Wadsworth Parkway/120th Avenue Interchange Combined Alternative Package
(Preferred Alternative) Configuration............................................................................4-38
Figure 4.6-2: Wadsworth Parkway/120th Avenue Interchange Existing Volumes, Geometry,
and Level of Service......................................................................................................4-39
Figure 4.6-3: Wadsworth Parkway/120th Avenue Interchange 2035 No Action Volumes,
Geometry, and Level of Service....................................................................................4-40
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Figure 4.6-4: Wadsworth Parkway/120th Avenue 2035 Combined Alternative Package
(Preferred Alternative) Volumes, Geometry, and Level of Service..............................4-41
Figure 4.7-1: Interlocken Loop Interchange Combined Alternative Package (Preferred
Alternative) Configuration.........................................................................................................4-46
Figure 4.7-2: Interlocken Loop Interchange Existing Volumes, Geometry, and Level
of Service.......................................................................................................................4-47
Figure 4.7-3: Interlocken Loop Interchange 2035 No Action Volumes, Geometry, and
Level of Service.............................................................................................................4-48
Figure 4.7-4: Interlocken Loop Interchange 2035 Combined Alternative Package (Preferred
Alternative) Volumes, Geometry, and Level of Service................................................4-49
Figure 4.8-1: McCaslin Boulevard Interchange Proposed Configuration.................................4-53
Figure 4.8-2: McCaslin Boulevard Interchange Existing Volumes, Geometry, and
Level of Service.............................................................................................................4-54
Figure 4.8-3: McCaslin Boulevard Interchange 2035 No Action Volumes, Geometry, and
Level of Service.............................................................................................................4-55
Figure 4.8-4: McCaslin Boulevard 2035 Combined Alternative Package (Preferred
Alternative) Volumes, Geometry, and Level of Service................................................4-56
Figure 4.9-1: Foothills Parkway/Table Mesa Drive Interchange Combined Alternative
(Local Streets Option) Package Configuration..............................................................4-60
Figure 4.9-2: Foothills Parkway/Table Mesa Drive Interchange Existing Volumes, Geometry,
and Level of Service......................................................................................................4-61
Figure 4.9-3: Foothills Parkway/Table Mesa Drive Interchange 2035 No Action Volumes,
Geometry, and Level of Service....................................................................................4-62
Figure 4.9-4: Foothills Parkway/Table Mesa Drive Interchange 2035 Combined Alternative
Package (Local Streets Option) Volumes, Geometry, and Level of Service................4-63

APPENDICES
Appendix A Modeling Methodology Report
Appendix B ITS Implementation Plan
Appendix C West End Design Options
Appendix D Broadway Interchange Alternatives

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Acronyms
a.m. morning
BPR Bureau of Public Roads
BRT bus rapid transit
CDOT Colorado Department of Transportation
DEIS Draft Environmental Impact Statement
DRCOG Denver Regional Council of Governments
EIS Environmental Impact Statement
HOV high-occupancy vehicle
FEIS Final Environmental Impact Statement
HCM Highway Capacity Manual
HOT high-occupancy toll
I-# Interstate-# (i.e., I-25, I-270, etc.)
ITS Intelligent Transportation System
LOS level of service
mph miles per hour
NCHRP National Cooperative Highway Research Program
p.m. evening
PHF peak-hour factor
RTD Regional Transportation District
SH State Highway
SOV single-occupant vehicle
TIP Transportation Improvement Program
US 36 United States Highway 36

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