Download - Guidelines for Road Diet Conversions
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KENTUCKY TRANSPORTATION CENTER
GUIDELINES FOR ROAD DIET CONVERSIONS
Research ReportKTC-11-19/SPR415-11-1F
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We provide services to the transportation community
through research, technology transfer and education.
We create and participate in partnerships
to promote safe and effective
transportation systems.
OUR MISSION
OUR VALUES
Teamwork
Listening and communicating along with
courtesy and respect for others.
Honesty and Ethical Behavior
Delivering the highest quality
products and services.
Continuous Improvement
In all that we do.
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R
GUIDELINES FOR ROAD DIET CONVERSIONS
Draft Final Report
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1. Report Number KTC-11-XX / SPR-415-11-1F
2. Government Accession No. 3. Recipient’s Catalog No.
4. Title and Subtitle Guidelines for Road Diet Conversions
5. Report Date November 2011
6. Performing Organization Code
7. Author(s) N. Stamatiadis, A. Kirk, C. Wang, and A. Cull
8. Performing Organization Report No. KTC-11-XX / SPR-415-11-1F
9. Performing Organization Name and Address Kentucky Transportation Center College of Engineering University of Kentucky Lexington, Kentucky 40506-0281
10. Work Unit No.
11. Contract or Grant No. SPR316
12. Sponsoring Agency Name and Address Kentucky Transportation Cabinet 200 Mero Street Frankfort, KY
13. Type of Report and Period Covered: Final Report; 07/10 – 12/11
Fi l14. Sponsoring Agency Code
15. Supplementary Notes
16. Abstract
17. Key Words Intersection Design, Roundabout, Inside left-turn, median u-turn, superstreet, continuous flow, jughandle, bowtie, intersection evaluation
18. Distribution Statement Unlimited
19. Security Classification (report) Security Classification (this page)
21. No. of Pg: 94 22. Price $0
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TABLE OF CONTENTS
LIST OF FIGURES
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LIST OF TABLES
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TABLE OF CONTENTS
LIST OF FIGURES
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LIST OF TABLES
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TABLE OF CONTENTS
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LIST OF FIGURES
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LIST OF TABLES
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EXECUTIVE SUMMARY
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INTRODUCTION
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LITERATURE REVIEW
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METHODOLOGY
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RESULTS
Signalized Intersections
negativelower
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negativeshorter
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Unsignalized Intersections
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negative lower
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Operations Models
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Signalized Intersection Safety
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Unsignalized Intersection Safety
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Safety Models
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Summary
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CASE STUDIES
US 27 Campbell County
Euclid Ave. Fayette County
KY 1428 Floyd County
US 172 Mercer County
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US 60 Woodford County
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Summary
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GUIDELINES
Road Diet Conversions
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CONCLUSIONS AND SUMMARY
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REFERENCES
Road Diets: Fixing the Big Roads
Evaluation of Lane Reduction “Road Diet” Measures and Their Effects of Crashes and Injuries
Evaluation of Lane Reduction Road Diet Measures on Crashes
Manual on Uniform Traffic Control Devices
Paper No. 07-1918
Transportation Research Record 2165
Surrogate Safety Assessment Model and Validation: Final Report,
Transportation Research Record 1784
) Guidelines for the Conversion of Urban Four-Lane Undivided Roadways to Three-Lane Two-Way Left-Turn Lane Facilities Final Report
Transportation Research Record 644
Journal of the Transportation Research Board No. 1953
Road Diet handbook: Setting Trends for Livable Communities
Proceedings 3rd International Symposium on Highway Geometric Design
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Highway Capacity Manual
Transportation Research Board Urban Street Symposium
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APPENDIX A
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ROAD DIET CASE STUDY EVALUATION US 60 VERSAILLES, KY
(FINAL) REPORT
Prepared by
Prepared for:
Date:
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TABLE OF CONTENTS
LIST OF FIGURES
LIST OF TABLES
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INTRODUCTION
Figure 1
Figure 1: Study Area
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ROAD DIET IMPLEMENTATION
Figure 2.
Figure 2: Typical Sections
Figure 3Figure 4.
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Figure 3: Road Diet Cross-Section
Figure 4: US 60 with Standard Road Diet
Figure 5.
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Figure 5: US 60 with Added Shoulders
Figure 6 Figure 7
Figure 6: US 60 with Parking
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Figure 7: US 60 Road Diet Types and Locations
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RESULTING CONDITIONS
Travel Times
Table 1
Table 1: Travel Time Study
Crash History
Table 2
Table 3
Table 2.
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Table 2: Pre- Road Diet Three-Year Crash Summary (2005-2007)
Total 39 15 24
Table 3: Post- Road Diet Three-Year Crash Summary (2009-2010)
Total 49 16 33
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EVALUATION METHODOLOGY
Safety Evaluation
Operations Evaluation
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EVALUATION SUMMARY
Table 4
Table 4: Summary of Road Diet Installation Effects
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ROAD DIET CASE STUDY EVALUATION EUCLID AVE. LEXINGTON, KY
(FINAL) REPORT
Prepared by
Prepared for:
Date:
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TABLE OF CONTENTS
LIST OF FIGURES
LIST OF TABLES
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INTRODUCTION
Figure 1
Figure 1: Study Area
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ROAD DIET IMPLEMENTATION
Figure 2.
Figure 2: Typical Section
Figure 3
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Figure 3: Road Diet Cross-Section
Figure 4.
Figure 4: Euclid Post-Road Diet Transformation
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RESULTING CONDITIONS
Travel Times
Table 1
Table 1: Travel Time Study
Crash History
Table 2
Table 3
Table 2.
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Table 2: Pre- Road Diet Three-Year Crash Summary (1997-1999)
Total 236 140 96
Table 3: Post- Road Diet Three-Year Crash Summary (2001-2003)
Total 104 49 55
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EVALUATION METHODOLOGY
Safety Evaluation
Operations Evaluation
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EVALUATION SUMMARY
Table 4
Table 4: Summary of Road Diet Installation Effects
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ROAD DIET CASE STUDY EVALUATION US 27 CAMPBELL COUNTY, KY
(FINAL) REPORT
Prepared by
Prepared for:
Date:
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TABLE OF CONTENTS
LIST OF FIGURES
LIST OF TABLES
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INTRODUCTION
Figure 1
Figure 1: Study Area
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ROAD DIET IMPLEMENTATION
Figure 2.
Figure 2: Typical Section
Figure3
Figure 3: Road Diet Cross-Section
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Figures 4 5.
Figure 4: US 27 Post-Road Diet Transformation (Near Ends with More Entrances)
Figure 5: US 27 Post-Road Diet Transformation (In Middle with Few Entrances)
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RESULTING CONDITIONS
Travel Times
Table 1
Table 1: Travel Time Study
Crash History
Table 2
Table 3
Table 2.
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Table 2: Pre- Road Diet Three-Year Crash Summary (2005-2007)
Total 60 15 47
Table 3: Post- Road Diet Three-Year Crash Summary (2009-2010)
Total 19 1 18
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EVALUATION METHODOLOGY
Safety Evaluation
Operations Evaluation
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EVALUATION SUMMARY
Table 4
Table 4: Summary of Road Diet Installation Effects
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ROAD DIET CASE STUDY EVALUATION KY 1428 FLOYD COUNTY, KY
(FINAL) REPORT
Prepared by
Prepared for:
Date:
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TABLE OF CONTENTS
LIST OF FIGURES
LIST OF TABLES
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INTRODUCTION
Figure 1
Figure 1: Study Area
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ROAD DIET IMPLEMENTATION
Figure 2 and Figure 3.
Figure 2: Initial Four Lane Section (North of KY 114)
Figure 3: Initial Two Lane Section (South of KY 114)
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Figure 4 Figure 5
Figure 4: Road Diet Cross-Section (North of 114)
Figure 5: Road Diet Cross-Section (South of 114)
Figures 6 Figure 7.
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Figure 6: KY 1428 Post-Road Diet Transformation
Figure 7: KY 1428 Post-Road Diet Transformation (Transition from Two Lanes)
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RESULTING CONDITIONS
Travel Times
Table 1
Table 1: Travel Time Study
Crash History
Table 2
Table 3
Table 2.
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Table 2: Pre- Road Diet Three-Year Crash Summary (2002-2004)
Total 115 17 98
Table 3: Post- Road Diet Three-Year Crash Summary (2007-2009)
Total 52 12 40
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EVALUATION METHODOLOGY
Safety Evaluation
Operations Evaluation
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EVALUATION SUMMARY
Table 4
Table 4: Summary of Road Diet Installation Effects
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ROAD DIET CASE STUDY EVALUATION US 127 HARRODSBURG, KY
(FINAL) REPORT
Prepared by
Prepared for:
Date:
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TABLE OF CONTENTS
LIST OF FIGURES
LIST OF TABLES
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INTRODUCTION
Figure 1
Figure 1: Study Area
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ROAD DIET IMPLEMENTATION
Figure 2.
Figure 2: Typical Section
Figure3
Figure 3: Road Diet Cross-Section
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Figure 4.
Figure 4: US 127 Post-Road Diet Transformation
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RESULTING CONDITIONS
Travel Times
Table 1
Table 1: Travel Time Study
Crash History
Table 2
Table 3
Table 2.
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Table 2: Pre- Road Diet Three-Year Crash Summary (2003-2005)
Total 164 89 75
Table 3: Post- Road Diet Three-Year Crash Summary (2007-2009)
Total 97 36 61
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EVALUATION METHODOLOGY
Safety Evaluation
Tables 2 3
Operations Evaluation
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EVALUATION SUMMARY
Table 4
Table 4: Summary of Road Diet Installation Effects
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ROAD DIET CASE STUDY EVALUATION KY 74 MIDDLESBORO, KY
KYTC DISTRICT 11 FINAL REPORT
Prepared by
Prepared for:
Date:
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TABLE OF CONTENTS
LIST OF FIGURES
LIST OF TABLES
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INTRODUCTION
Figure 1
Figure 1: Study Area
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EXISTING CONDITIONS
Figure 2
Figure 2: Typical Section
Appendix A
Traffic Volumes
Appendix B
Appendix B.
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Travel Times
Table 1
Table 1: Travel Time Study
Westbound
Total 48 47 43Eastbound
Total 51 49 52
Crash History
Table 2
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Table 2: Three-Year Crash Summary (2007-2009)
Total 135 100 35
Appendix C
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ROAD DIET ALTERNATIVE
Figure 3
Figure 3: Typical Cross-Section
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EVALUATION METHODOLOGY
Calibration
Table 3
Table 3: VISSIM Travel Time Calibration
Westbound
Total 48 47 47 49 43 54Eastbound
Total 51 50 49 51 52 59
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Measures of Effectiveness
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RESULTS
Operational Analysis Table 4
Table 4: Travel Time Corridor Level
Travel Segment (KY 74)
Travel Time(sec)AM Noon PM
4-Lane 3-Lane 4-Lane 3-Lane 4-Lane 3-LaneWestbound
Total 47 41 49 40 54 49Eastbound
Total 50 50 51 50 59 54
Table 5
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Table 5: PM Peak Hour Intersection Operations Summary
Safety Analysis
Table 6
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Table 6: Safety Effects of Road Diet
Total 27 - 11 -
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DESIGN CONSIDERATIONS
Figure 4
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EVALUATION SUMMARY
Table 7
Table 7: Summary of Road Diet Installation Effects
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APPENDIX A Existing Conditions
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APPENDIX B Traffic Volumes
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6
ING
ITE
CODE
210
CODE
934
E ST
ORE
ITE
CODE
935
22nd
20 th
21st Street
33, 1
6, 2
5
6
45
4
22
15
45
3
8
20
47
6
10
14, 2
, 2
3, 8
, 4
31, 9
, 18
6, 1
541
553
506
506
50
482
470
476
476
4
4
4
10
10
4
4
10
10
44
50
0
9
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6FITZPATRICK
4
45
2
50
3
46
5
3
20
50
1
135
6, 3
9, 5
27, 2
6, 2
7
2, 1
, 7
3, 3
, 183
506
471
471
655
485
506
506
656
19 th
18 th
4
10
10 10
10
4
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6
120
52
1
38
30
56
3
15
49, 7
, 13
18, 9
, 17
679
551
15 th
4
10
4
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22nd
20 th
21st Street
4
4
10
10
4
4
10
10
29, 1
8, 4
2
8
47
4
38
43
44
0
13
24
46
0
30
42
42
9
18
40, 1
9, 2
3
8, 1
0, 2
6
69, 2
4, 4
8
11, 3
49
6 48
9 48
9
520
500
508
514
5
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FITZPATRICK
19 th
18 th
4
10
10 10
10
4
14
43
0
58
4
49
4
10
28
49
1
148
18, 6
4, 4
93, 6
9, 6
9
9, 4
, 27
2, 1
4, 1
85
505
508
508
706
541
502
502
667
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15 th
4
0
4 11
8
562
50
30
50
2
15
110,
10,
34
31, 2
3, 1
9
730
615
54
7
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22nd
20 th
21st Street
9
9
5
5
9
9
5
5
0
55, 3
4, 1
5
26
59
7
55
33
65
9
26
30
71
7
48
13, 1
1, 3
0
14, 1
0, 4
0
71, 3
0, 6
0
10, 3
77
1 79
5 79
5 81
678
686
7
34
72
5
12
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FITZPATRICK
19 th
18 th
9
5
5 5
5
9
85
60
6
12
242
56
0
20
7
68
7
3
7, 6
9, 1
2
99, 8
2, 8
1
6, 4
, 33
10, 1
0, 3
26
822
919
712
703
703
697
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15 th
9 12
5
768
10
55
61
2
27
45, 2
8, 4
5
56, 1
7, 2
7
903
840
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APPENDIX C Crash Diagrams
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APPENDIX B
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INTRODUCTION
ROAD DIET CONVERSIONS
Process
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Operational evaluation
Safety evaluation
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Operational Performance
Safety Performance
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Other Considerations
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Design Considerations
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Performance Evaluation
When Not to Convert
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Analysis Checklist
Operational aspects
Safety aspects
Multimodal operations
Access managementLivabilityOperational consistencyTransition designCross section elements
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REFERNCES
Guidelines for Road Diet Conversions,
2.
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