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Roundabout Planning, Design, and Operations Manual
Roundabout Planning, Design, and Operations Manual December 2015 Alabama Department of Transportation ROUNDABOUT PLANNING, DESIGN, AND OPERATIONS MANUAL December 2015 Prepared by: The University Transportation Center for of Alabama Steven L. Jones, Ph.D. Abdulai Abdul Majeed Steering Committee Tim Barnett, P.E., ALDOT Office of Safety Operations Stuart Manson, P.E., ALDOT Office of Safety Operations Sonya Baker, ALDOT Office of Safety Operations Stacey Glass, P.E., ALDOT Maintenance Stan Biddick, ALDOT Design Bryan Fair, ALDOT Planning Steve Walker, P.E., ALDOT R.O.W. Vince Calametti, P.E., ALDOT 9th Division James Brown, P.E., ALDOT 2nd Division James Foster, P.E., Mobile County Clint Andrews, Federal Highway Administration Blair Perry, P.E., Gresham Smith & Partners Howard McCulloch, P.E., NE Roundabouts DISCLAIMER This manual provides guidelines and recommended practices for planning and designing roundabouts in the State of Alabama. This manual cannot address or anticipate all possible field conditions that will affect a roundabout design. It remains the ultimate responsibility of the design engineer to ensure that a design is appropriate for prevailing traffic and field conditions. TABLE OF CONTENTS 1. Introduction 1.1. Purpose ...................................................................................................... 1-5 1.2. Scope and Organization ............................................................................... 1-7 1.3. Limitations ................................................................................................... -
City Maintained Street Inventory
City Maintained Streets Inventory DATE APPROX. AVG. STREET NAME ACCEPTED BEGINNING AT ENDING AT LENGTH WIDTH ACADEMYText0: ST Text6: HENDERSONVLText8: RD BROOKSHIREText10: ST T0.13 Tex20 ACADEMYText0: ST EXT Text6: FERNText8: ST MARIETTAText10: ST T0.06 Tex17 ACTONText0: WOODS RD Text6:9/1/1994 ACTONText8: CIRCLE DEADText10: END T0.24 Tex19 ADAMSText0: HILL RD Text6: BINGHAMText8: RD LOUISANAText10: AVE T0.17 Tex18 ADAMSText0: ST Text6: BARTLETText8: ST CHOCTAWText10: ST T0.16 Tex27 ADAMSWOODText0: RD Text6: CARIBOUText8: RD ENDText10: OF PAVEMENT T0.16 Tex26 AIKENText0: ALLEY Text6: TACOMAText8: CIR WESTOVERText10: ALLEY T0.05 Tex12 ALABAMAText0: AVE Text6: HANOVERText8: ST SWANNANOAText10: AVE T0.33 Tex24 ALBEMARLEText0: PL Text6: BAIRDText8: ST ENDText10: MAINT T0.09 Tex18 ALBEMARLEText0: RD Text6: BAIRDText8: ST ORCHARDText10: RD T0.2 Tex20 ALCLAREText0: CT Text6: ENDText8: C&G ENDText10: PVMT T0.06 Tex22 ALCLAREText0: DR Text6: CHANGEText8: IN WIDTH ENDText10: C&G T0.17 Tex18 ALCLAREText0: DR Text6: SAREVAText8: AVE CHANGEText10: IN WIDTH T0.18 Tex26 ALEXANDERText0: DR Text6: ARDIMONText8: PK WINDSWEPTText10: DR T0.37 Tex24 ALEXANDERText0: DR Text6: MARTINText8: LUTHER KING WEAVERText10: ST T0.02 Tex33 ALEXANDERText0: DR Text6: CURVEText8: ST ARDMIONText10: PK T0.42 Tex24 ALLENText0: AVE 0Text6:/18/1988 U.S.Text8: 25 ENDText10: PAV'T T0.23 Tex19 ALLENText0: ST Text6: STATEText8: ST HAYWOODText10: RD T0.19 Tex23 ALLESARNText0: RD Text6: ELKWOODText8: AVE ENDText10: PVMT T0.11 Tex22 ALLIANCEText0: CT 4Text6:/14/2009 RIDGEFIELDText8: -
GUIDELINES for TIMING and COORDINATING DIAMOND November 2000 INTERCHANGES with ADJACENT TRAFFIC SIGNALS 6
Technical Report Documentation Page 1. Report No. 2. Government Accession No. 3. Recipient's Catalog No. TX-00/4913-2 4. Title and Subtitle 5. Report Date GUIDELINES FOR TIMING AND COORDINATING DIAMOND November 2000 INTERCHANGES WITH ADJACENT TRAFFIC SIGNALS 6. Performing Organization Code 7. Author(s) 8. Performing Organization Report No. Nadeem A. Chaudhary and Chi-Leung Chu Report 4913-2 9. Performing Organization Name and Address 10. Work Unit No. (TRAIS) Texas Transportation Institute The Texas A&M University System 11. Contract or Grant No. College Station, Texas 77843-3135 Project No. 7-4913 12. Sponsoring Agency Name and Address 13. Type of Report and Period Covered Texas Department of Transportation Research: Construction Division September 1998 – August 2000 Research and Technology Transfer Section 14. Sponsoring Agency Code P. O. Box 5080 Austin, Texas 78763-5080 15. Supplementary Notes Research performed in cooperation with the Texas Department of Transportation. Research Project Title: Operational Strategies for Arterial Congestion at Interchanges 16. Abstract This report contains guidelines for timing diamond interchanges and for coordinating diamond interchanges with closely spaced adjacent signals on the arterial. Texas Transportation Institute (TTI) researchers developed these guidelines during a two-year project funded by the Texas Department of Transportation. 17. Key Words 18. Distribution Statement Diamond Interchanges, Capacity Analysis, Traffic No restrictions. This document is available to the Signal Coordination, Traffic Congestion, Signalized public through NTIS: Arterials National Technical Information Service 5285 Port Royal Road Springfield, Virginia 22161 19. Security Classif.(of this report) 20. Security Classif.(of this page) 21. No. of Pages 22. Price Unclassified Unclassified 50 Form DOT F 1700.7 (8-72) Reproduction of completed page authorized GUIDELINES FOR TIMING AND COORDINATING DIAMOND INTERCHANGES WITH ADJACENT TRAFFIC SIGNALS by Nadeem A. -
Us 17 Corridor Study, Brunswick County Phase Iii (Functional Designs)
US 17 CORRIDOR STUDY, BRUNSWICK COUNTY PHASE III (FUNCTIONAL DESIGNS) FINAL REPORT R-4732 Prepared For: North Carolina Department of Transportation Prepared By: PBS&J 1616 East Millbrook Road, Suite 310 Raleigh, NC 27609 October 2005 TABLE OF CONTENTS 1 INTRODUCTION / BACKGROUND..............................................1-1 1.1 US 17 as a Strategic Highway Corridor...........................................................1-1 1.2 Study Objectives..............................................................................................1-2 1.3 Study Process...................................................................................................1-3 2 EXISTING CONDITIONS ................................................................2-6 2.1 Turning Movement Volumes...........................................................................2-7 2.2 Capacity Analysis............................................................................................2-7 3 NO-BUILD CONDITIONS..............................................................3-19 3.1 Turning Movement Volumes.........................................................................3-19 3.2 Capacity Analysis..........................................................................................3-19 4 DEFINITION OF ALTERNATIVES .............................................4-30 4.1 Intersection Improvements Alternative..........................................................4-31 4.2 Superstreet Alternative...................................................................................4-44 -
A Guide for HOT Lane Development FHWA
U.S. Department of Transportation Federal Highway Administration A Guide for HOT LANE DEVELOPMENT A Guide for HOT LANE DEVELOPMENT BY WITH IN PARTNERSHIP WITH U.S. Department of Transportation Federal Highway Administration PRINCIPAL AUTHORS Benjamin G. Perez, AICP PB CONSULT Gian-Claudia Sciara, AICP PARSONS BRINCKERHOFF WITH CONTRIBUTIONS FROM T. Brent Baker Stephanie MacLachlin PB CONSULT PB CONSULT Kiran Bhatt Carol C. Martsolf KT ANALYTICS PARSONS BRINCKERHOFF James S. Bourgart Hameed Merchant PARSONS BRINCKERHOFF HOUSTON METRO James R. Brown John Muscatell PARSONS BRINCKERHOFF COLORADO DEPARTMENT OF TRANSPORTATION Ginger Daniels John O’Laughlin TEXAS TRANSPORTATION INSTITUTE PARSONS BRINCKERHOFF Heather Dugan Bruce Podwal COLORADO DEPARTMENT OF TRANSPORTATION PARSONS BRINCKERHOFF Charles Fuhs Robert Poole PARSONS BRINCKERHOFF REASON PUBLIC POLICY INSTITUTE Ira J. Hirschman David Pope PB CONSULT PARSONS BRINCKERHOFF David Kaplan Al Schaufler SAN DIEGO ASSOCIATION OF GOVERNMENTS PARSONS BRINCKERHOFF Hal Kassoff Peter Samuel PARSONS BRINCKERHOFF TOLL ROADS NEWSLETTER Kim Kawada William Stockton SAN DIEGO ASSOCIATION OF GOVERNMENTS TEXAS TRANSPORTATION INSTITUTE Tim Kelly Myron Swisher HOUSTON METRO COLORADO DEPARTMENT OF TRANSPORTATION Stephen Lockwood Sally Wegmann PB CONSULT TEXAS DEPARTMENT OF TRANSPORTATION Chapter 1 Hot Lane Concept And Rationale........................................................................2 1.1 HOT lanes Defined .................................................................................................2 -
Subdivision Street Standards Manual
TOWN OF MARANA Subdivision Street Standards Manual May 2013 TABLE OF CONTENTS CHAPTER & SECTION 1.0 INTRODUCTION AND PURPOSE………………………………………………. 1 1.1 Introduction………………………………………………………………… 1 1.2 Purpose……………………………………………………………………... 1 1.3 Applicability……………………………………………………………….. 2 2.0 FUNCTIONAL CLASSIFICATION AND REGULATIONS…………………….. 2 2.1 Functional Classification………………………………………….………... 2 2.2 Incorporated Regulations Adopted by Reference…………………………... 3 3.0 TRAFFIC STUDIES………………………………………………………………. 3 4.0 STREET LAYOUT AND GEOMETRIC DESIGN………………………………... 4 4.1 Street Layout………………………………………………………………… 4 4.2 Cul-de-sacs………………………………………………………………….. 5 4.3 Design Speed………………………………………………………………... 6 4.4 Design Vehicle…………………………………………………….………… 6 4.5 Horizontal Alignment……………………………………………………….. 7 4.6 Vertical Alignment………………………………………………………….. 7 4.7 Intersection Alignment…………………………………………….………… 8 4.8 Intersection Sight Distance…………………………………………………. 9 4.9 Residential and Commercial Drive Entrances………………………………. 10 4.10 Roadway Superelevation…………………………………………………….. 11 4.11 Roadway Drainage Crossings……………………………………………….. 11 4.12 Mountainous Terrain………………………………………………………… 11 4.13 Environmentally Sensitive Roadways………………………………………. 12 4.14 Alternative Access…………………………………………………………… 12 5.0 RIGHT OF WAY……………………………………………………………………. 13 6.0 ELEMENTS IN THE CROSS SECTION…………………………………………... 14 6.1 Travel Lanes……………………………………………………….………… 14 6.2 Curbing……………………………………………………………………… 14 6.3 Sidewalks………………………………………………………….………… 15 6.4 Shoulders………………………………………………………….………… 16 6.5 Roadside -
What Are the Advantages of Roundabouts?
What is a roundabout? A roundabout is an intersection where traffic travels around a Circulatory central island in a counter- Truck Apron Roadway clockwise direction. Vehicles entering or exiting the roundabout must yield to vehicles, bicyclists, and pedestrians. Figure 1 presents the elements of a roundabout. Yield Line Splitter Island Figure 1: Elements of a Roundabout What are the advantages of roundabouts? • Less Traffic Conflict: Figure 2 compares the conflict points between a conventional intersection and a modern roundabout. The lower number of conflict points translates to less potential for accidents. • Greater safety(1): Primarily achieved by slower speeds and elimination of left turns. Design elements of the roundabouts cause drivers to reduce their speeds. • Efficient traffic flow: Up to 50% increase in traffic capacity • Reduced Pollution and fuel usage: Less stops, shorter queues and no left turn storage. • Money saved: No signal equipment to install or maintain, plus savings in electricity use. • Community benefits: Traffic calming and enhanced aesthetics by landscaping. (1) Statistics published by the U.S. Dept. of transportation, Federal Highway Administration shows roundabouts to have the following advantages over conventional intersections: • 90% reduction in fatalities • 76% reduction in injuries • 35% reduction in pedestrian accidents. Signalized Intersection Roundabout Figure 2: Conflict Point Comparison How to Use a Roundabout Driving a car • Slow down as you approach the intersection. • Yield to pedestrians and bicyclists crossing the roadway. • Watch for signs and pavement markings. • Enter the roundabout if gap in traffic is sufficient. • Drive in a counter-clockwise direction around the roundabout until you reach your exit. Do not stop or pass other vehicles. -
MDOT Access Management Guidebook
ReducingTrafficCongestion andImprovingTrafficSafety inMichiganCommunities: THE ACCESSMANAGEMENT GUIDEBOOK COMMUNITYA COMMUNITYB Cover graphics and ROW graphic by John Warbach, Planning & Zoning Center, Inc. Photos by Tom Doyle, Michigan Department of Transportation. Speed Differential graphic by Michigan Department of Transportation. Road Hierarchy graphic by Rossman Martin & Associates, Inc. Reducing Traffic Congestion and Improving Traffic Safety in Michigan Communities: THE ACCESS MANAGEMENT GUIDEBOOK October, 2001 Prepared by the Planning & Zoning Center, Inc. 715 N. Cedar Street Lansing, MI 48906-5206 517/886-0555 (tele), www.pzcenter.com Under contract to the Michigan Department of Transportation With the assistance of three Advisory Committees listed on the next page The opinions, findings and conclusions expressed in this publication are those of the authors and not necessarily those of the Michigan State Transportation Commission or the Michigan Department of Transportation or the Federal Highway Administration. Dedication This Guidebook is dedicated to the countless local elected officials, planning and zoning commissioners, zoning administrators, building inspectors, professional planners, and local, county and state road authority personnel who: • work tirelessly every day to make taxpayers investment in Michigan roads stretch as far as it can with the best possible result; and • who try to make land use decisions that build better communities without undermining the integrity of Michigan's road system. D:\word\access\title -
Chapter 7: Transportation Mode Choice, Safety & Connections
Chapter 7: Transportation Mode Choice, Safety & Connections Comprehensive Plan 2040 7-2 TRANSPORTATION City of Lake Elmo Comprehensive Plan 2040 INTRODUCTION The purpose of the Transportation Chapter is to guide development, maintenance, and improvement of the community’s transportation network. This Chapter incorporates and addresses the City’s future transportation needs based on the planned future land uses, development areas, housing, parks and trail systems. The City’s transportation network is comprised of several systems including roadways, transit services, trails, railroads and aviation that all work together to move people and goods throughout, and within, the City. This Chapter identifies the existing and proposed transportation system, examines potential deficiencies, and sets investment priorities. The following Chapter plans for an integrated transportation system that addresses each of the following topics in separate sections: • Roadway System 7-1 • Transit Facilities • Bikway & Trail System • Freight & Rail • Aviation The last section of this Chapter provides a summary and implementation section which addresses each of the components of the system, if any additional action within this planning period is expected. The Implementation Plan sets the groundwork for investment and improvements to the transportation network consistent with the goals, analyses, and conclusions of this Plan. As discussed in preceding Chapters of this Comprehensive Plan, the Transportation Chapter is intended to be dynamic and responsive to the City’s planned land uses and development patterns. As the City’s conditions change and improvements occur, this Chapter should be reviewed for consistency with the Plan to ensure that the transportation systems support the City’s ultimate vision for the community through this planning period. -
Rules for Driving Roundabouts
RULES FOR DRIVING ROUNDABOUTS www.wisconsinroundabouts.gov General information for all roundabouts Steps for driving a roundabout: Roundabouts are becoming more common 1. Slow down. Obey traffic signs. in the U.S. because they provide safer and 2. Yield to pedestrians and bicyclists. more efficient traffic flow than standard 3. Yield to traffic on your left intersections. By keeping traffic moving one-way already in the roundabout. in a counterclockwise direction, there are fewer 4. Enter the roundabout when conflict points and traffic flows smoothly. there is a safe gap in traffic. Crash statistics show that roundabouts 5. Keep your speed low reduce fatal crashes about 90%, reduce within the roundabout. injury crashes about 75%, and reduce overall 6. As you approach your exit, crashes about 35%, when compared Draft 5 February 2, 2009 turn on your right turn signal. to other types of intersection control. 7. Yield to pedestrians and When driving a roundabout, the same bicycles as you exit. general rules apply as for maneuvering Emergency vehicles in the roundabout through any other type of intersection. P Always yield to emergency vehicles. Truck apron P If you have not entered the roundabout, pull Large vehicles need more space when driving over and allow emergency vehicles to pass. in a roundabout. A truck apron is a paved area P If you have entered the roundabout, on the inside of the roundabout for the rear wheels continue to your exit, then pull over of large trucks to use when turning, sometimes and allow emergency vehicles to pass. referred to as off-tracking. -
US 278 Independent Review Report
US 278 Independent Review May 2021 Contents Introduction .............................................................................................................................. 1 Purpose .................................................................................................................................. 1 Coordination Efforts ................................................................................................................ 1 Oversight Committee .............................................................................................................. 1 SCDOT ................................................................................................................................... 2 Items of Review and Analysis ................................................................................................. 2 Growth Rate/Future Traffic ..................................................................................................... 2 Crash Data/ Safety ................................................................................................................. 3 Reversible Lanes .................................................................................................................... 4 Preliminary Alternatives and Matrix ........................................................................................ 5 Reasonable Alternatives and Matrix ....................................................................................... 5 Additional New Location Alternatives ..................................................................................... -
REVISED AGENDA PUEBLO COUNTY PLANNING COMMISSION Commissioners’ Chambers, Pueblo County Courthouse 215 West 10Th Street August 19, 2020 5:30 P.M
REVISED AGENDA PUEBLO COUNTY PLANNING COMMISSION Commissioners’ Chambers, Pueblo County Courthouse 215 West 10th Street August 19, 2020 5:30 P.M. NOTICE REGARDING COVID-19 (Novel Coronavirus): The Board of County Commissioners implemented temporary operational directives on June 16, 2020 to partially reopen public access to county-owned facilities. Beginning on June 22, 2020, there will be limited seats available for the public to attend Planning Commission meetings in person. Anyone interested in attending a meeting in person may do so by submitting a Meeting Request Form on Pueblo County’s web page, subject to availability of seating. The public may provide written comments prior to the meeting by emailing those comments by 5:00 p.m., on Monday, August 17, 2020, to [email protected]. The meeting will be streamed live on the County’s Facebook Page https://www.facebook.com/PuebloCounty/. (The Record: The Planning Department staff memorandum and the application submitted by the applicant for each agenda item and any supplemental information distributed by staff at the meeting are automatically incorporated as part of the Record unless specific objections are raised and sustained at the public hearing. Any additional materials used by the applicant or others in support of or in opposition to a particular agenda item may, at the discretion of the person or entity using the materials, be submitted for inclusion in the Record. Such materials for which a request for inclusion in the Record is made shall, at the discretion of the administrative body, be made a part of the Record. Note: Any materials including documents and/or instruments submitted for inclusion in the Record and admitted by the administrative body must be left with the Clerk.) 1.