guidelines for road diet conversions

KENTUCKY TRANSPORTATION CENTER

GUIDELINES FOR ROAD DIET CONVERSIONS

Research ReportKTC-11-19/SPR415-11-1F

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GUIDELINES FOR ROAD DIET CONVERSIONS

Draft Final Report

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

TABLE OF CONTENTS

LIST OF FIGURES

LIST OF TABLES

TABLE OF CONTENTS

LIST OF FIGURES

LIST OF TABLES

TABLE OF CONTENTS

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LIST OF FIGURES

LIST OF TABLES

EXECUTIVE SUMMARY

INTRODUCTION

LITERATURE REVIEW

METHODOLOGY

RESULTS

Signalized Intersections

negativelower

negativeshorter

Unsignalized Intersections

negative lower

Operations Models

Signalized Intersection Safety

Unsignalized Intersection Safety

Safety Models

Summary

CASE STUDIES

US 27 Campbell County

Euclid Ave. Fayette County

KY 1428 Floyd County

US 172 Mercer County

US 60 Woodford County

Summary

GUIDELINES

Road Diet Conversions

CONCLUSIONS AND SUMMARY

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,


) Guidelines for the Conversion of Urban Four-Lane Undivided Roadways to Three-Lane Two-Way Left-Turn Lane Facilities Final Report


Journal of the Transportation Research Board No. 1953

Road Diet handbook: Setting Trends for Livable Communities

Proceedings 3rd International Symposium on Highway Geometric Design

Highway Capacity Manual

Transportation Research Board Urban Street Symposium

APPENDIX A

ROAD DIET CASE STUDY EVALUATION US 60 VERSAILLES, KY

(FINAL) REPORT

Prepared by

Prepared for:

Date:

TABLE OF CONTENTS

LIST OF FIGURES

LIST OF TABLES

INTRODUCTION

Figure 1

Figure 1: Study Area

ROAD DIET IMPLEMENTATION

Figure 2.

Figure 2: Typical Sections

Figure 3Figure 4.

Figure 3: Road Diet Cross-Section

Figure 4: US 60 with Standard Road Diet

Figure 5.

Figure 5: US 60 with Added Shoulders

Figure 6 Figure 7

Figure 6: US 60 with Parking

Figure 7: US 60 Road Diet Types and Locations

RESULTING CONDITIONS

Travel Times

Table 1

Table 1: Travel Time Study

Crash History

Table 2

Table 3

Table 2.

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

EVALUATION METHODOLOGY

Safety Evaluation

Operations Evaluation

EVALUATION SUMMARY

Table 4

Table 4: Summary of Road Diet Installation Effects

ROAD DIET CASE STUDY EVALUATION EUCLID AVE. LEXINGTON, KY

(FINAL) REPORT

Prepared by

Prepared for:

Date:

TABLE OF CONTENTS

LIST OF FIGURES

LIST OF TABLES

INTRODUCTION

Figure 1



Figure 2.

Figure 2: Typical Section

Figure 3


Figure 4.

Figure 4: Euclid Post-Road Diet Transformation


Travel Times

Table 1


Crash History

Table 2

Table 3

Table 2.


Total 236 140 96


Total 104 49 55


Safety Evaluation


EVALUATION SUMMARY

Table 4


ROAD DIET CASE STUDY EVALUATION US 27 CAMPBELL COUNTY, KY

(FINAL) REPORT

Prepared by

Prepared for:

Date:

TABLE OF CONTENTS

LIST OF FIGURES

LIST OF TABLES

INTRODUCTION

Figure 1



Figure 2.


Figure3


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)


Travel Times

Table 1


Crash History

Table 2

Table 3

Table 2.


Total 60 15 47


Total 19 1 18


Safety Evaluation


EVALUATION SUMMARY

Table 4


ROAD DIET CASE STUDY EVALUATION KY 1428 FLOYD COUNTY, KY

(FINAL) REPORT

Prepared by

Prepared for:

Date:

TABLE OF CONTENTS

LIST OF FIGURES

LIST OF TABLES

INTRODUCTION

Figure 1



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)

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.

Figure 6: KY 1428 Post-Road Diet Transformation

Figure 7: KY 1428 Post-Road Diet Transformation (Transition from Two Lanes)


Travel Times

Table 1


Crash History

Table 2

Table 3

Table 2.


Total 115 17 98


Total 52 12 40


Safety Evaluation


EVALUATION SUMMARY

Table 4


ROAD DIET CASE STUDY EVALUATION US 127 HARRODSBURG, KY

(FINAL) REPORT

Prepared by

Prepared for:

Date:

TABLE OF CONTENTS

LIST OF FIGURES

LIST OF TABLES

INTRODUCTION

Figure 1



Figure 2.


Figure3


Figure 4.

Figure 4: US 127 Post-Road Diet Transformation


Travel Times

Table 1


Crash History

Table 2

Table 3

Table 2.


Total 164 89 75


Total 97 36 61


Safety Evaluation

Tables 2 3


EVALUATION SUMMARY

Table 4


ROAD DIET CASE STUDY EVALUATION KY 74 MIDDLESBORO, KY

KYTC DISTRICT 11 FINAL REPORT

Prepared by

Prepared for:

Date:

TABLE OF CONTENTS

LIST OF FIGURES

LIST OF TABLES

INTRODUCTION

Figure 1


EXISTING CONDITIONS

Figure 2


Appendix A

Traffic Volumes

Appendix B

Appendix B.

Travel Times

Table 1


Westbound

Total 48 47 43Eastbound

Total 51 49 52

Crash History

Table 2

Table 2: Three-Year Crash Summary (2007-2009)

Total 135 100 35

Appendix C

ROAD DIET ALTERNATIVE

Figure 3

Figure 3: Typical Cross-Section


Calibration

Table 3

Table 3: VISSIM Travel Time Calibration

Westbound

Total 48 47 47 49 43 54Eastbound

Total 51 50 49 51 52 59

Measures of Effectiveness

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

Table 5: PM Peak Hour Intersection Operations Summary

Safety Analysis

Table 6

Table 6: Safety Effects of Road Diet

Total 27 - 11 -

DESIGN CONSIDERATIONS

Figure 4

EVALUATION SUMMARY

Table 7


APPENDIX A Existing Conditions

APPENDIX B Traffic Volumes

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

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

6

120

52

1

38

30

56

3

15

49, 7

, 13

18, 9

, 17

679

551

15 th

4

10

4

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

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

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

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

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

15 th

9 12

5

768

10

55

61

2

27

45, 2

8, 4

5

56, 1

7, 2

7

903

840

APPENDIX C Crash Diagrams

APPENDIX B

INTRODUCTION

ROAD DIET CONVERSIONS

Process

Operational evaluation

Safety evaluation

Operational Performance

Safety Performance

Other Considerations

Design Considerations

Performance Evaluation

When Not to Convert

Analysis Checklist

Operational aspects

Safety aspects

Multimodal operations

Access managementLivabilityOperational consistencyTransition designCross section elements

REFERNCES

Guidelines for Road Diet Conversions,

2.

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