Design and Operation of Diamond Interchanges
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Chapter 10 Grade Separations and Interchanges
2005 Grade Separations and Interchanges CHAPTER 10 GRADE SEPARATIONS AND INTERCHANGES 10.0 INTRODUCTION AND GENERAL TYPES OF INTERCHANGES The ability to accommodate high volumes of traffic safely and efficiently through intersections depends largely on the arrangement that is provided for handling intersecting traffic. The greatest efficiency, safety, and capacity, and least amount of air pollution are attained when the intersecting through traffic lanes are grade separated. An interchange is a system of interconnecting roadways in conjunction with one or more grade separations that provide for the movement of traffic between two or more roadways or highways on different levels. Interchange design is the most specialized and highly developed form of intersection design. The designer should be thoroughly familiar with the material in Chapter 9 before starting the design of an interchange. Relevant portions of the following material covered in Chapter 9 also apply to interchange design: • general factors affecting design • basic data required • principles of channelization • design procedure • design standards Material previously covered is not repeated. The discussion which follows covers modifications in the above-mentioned material and additional material pertaining exclusively to interchanges. The economic effect on abutting properties resulting from the design of an intersection at-grade is usually confined to the area in the immediate vicinity of the intersection. An interchange or series of interchanges on a freeway or expressway through a community may affect large contiguous areas or even the entire community. For this reason, consideration should be given to an active public process to encourage context sensitive solutions. Interchanges must be located and designed to provide the most desirable overall plan of access, traffic service, and community development. -
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. -
Recommended Ramp Design Procedures for Facilities Without Frontage Roads
Technical Report Documentation Page 1. Report No. 2. Government Accession No. 3. Recipient's Catalog No. FHWA/TX-05/0-4538-3 4. Title and Subtitle 5. Report Date RECOMMENDED RAMP DESIGN PROCEDURES FOR September 2004 FACILITIES WITHOUT FRONTAGE ROADS 6. Performing Organization Code 7. Author(s) 8. Performing Organization Report No. J. Bonneson, K. Zimmerman, C. Messer, and M. Wooldridge Report 0-4538-3 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. 0-4538 12. Sponsoring Agency Name and Address 13. Type of Report and Period Covered Texas Department of Transportation Technical Report: Research and Technology Implementation Office September 2002 - August 2004 P.O. Box 5080 14. Sponsoring Agency Code Austin, Texas 78763-5080 15. Supplementary Notes Project performed in cooperation with the Texas Department of Transportation and the Federal Highway Administration. Project Title: Ramp Design Considerations for Facilities without Frontage Roads 16. Abstract Based on a recent change in Texas Department of Transportation (TxDOT) policy, frontage roads are not to be included along controlled-access highways unless a study indicates that the frontage road improves safety, improves operations, lowers overall facility costs, or provides essential access. Interchange design options that do not include frontage roads are to be considered for all new freeway construction. Ramps in non- frontage-road settings can be more challenging to design than those in frontage-road settings for several reasons. Adequate ramp length, appropriate horizontal and vertical curvature, and flaring to increase storage area at the crossroad intersection should all be used to design safe and efficient ramps for non-frontage-road settings. -
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 -
Interchange Modification Report
INTERSTATE 75 AND STATE ROAD 884 (COLONIAL BOULEVARD) INTERCHANGE LEE COUNTY, FLORIDA INTERCHANGE MODIFICATION REPORT Prepared for: Florida Department of Transportation – District One February 2015 Interchange Modification Report Interstate 75 and State Road 884 (Colonial Boulevard), Lee County, Florida I, Akram M. Hussein, Florida P.E. Number 58069, have prepared or reviewed/supervised the traffic analysis contained in this study. The study has been prepared in accordance and following guidelines and methodologies consistent with FHWA, FDOT and Lee County policies and technical standards. Based on traffic count information, general data sources, and other pertinent information, I certify that this traffic analysis has been prepared using current and acceptable traffic engineering and transportation planning practices and procedures. ______________________________ Akram M. Hussein, P.E. #58069 ______________________________ Date TABLE OF CONTENTS Page SECTION 1 EXECUTIVE SUMMARY ......................................................................... 1-1 SECTION 2 PURPOSE AND NEED .............................................................................. 2-1 SECTION 3 METHODOLOGY ...................................................................................... 3-1 SECTION 4 EXISTING CONDITIONS ......................................................................... 4-1 4.1 DATA COLLECTION METHODOLOGY ........................................................................ 4-5 4.2 TRAFFIC FACTORS ......................................................................................................... -
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. -
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 ..................................................................................... -
Diverging Diamond Interchange (DDI)
What Why How CFI - SR 400 @ SR 53, Dawson County, GA Intersection Control Evaluation A performance-based approach to objectively screen alternatives by focusing on the safety related benefits of each. Traditional Intersections SR 11 @ SR 124, Jackson County, GA Johnson Rd @ SR 74, Fayette County, GA Dogwood Trail @ SR 74, Fayette County, GA Roundabout SR 138 @ Hembree Rd, Fulton County, GA Roundabout • 215+ Existing • 50+ On System/or GDOT $$ • 165+ Off System • 20+ Currently Under Construction • 155+ Planned/programmed RBTs 6 Diverging Diamond Interchange (DDI) I-95 @ SR 21, Port Wentworth, Chatham County, GA Diverging Diamond Interchange (DDI) • 6 Existing • 2 Design/under construction • 10+ Under consideration Total: 18+ Continuous Green T SR 120 @ John Ward Rd SW, Cobb County, GA Single Point Urban Interchange (SPUI) SR 400 @ Lenox Rd NE, Fulton County, GA Reduced Conflict U-Turn (RCUT) SR 20 @ Nail Rd, Henry County, GA Continuous Flow Intersection (CFI) SR 400 @ SR 53, Dawson County, GA Unsignalized Signalized • Minor Stop • Signal • All-Way Stop • Median U-Turn • Mini Roundabout • RCUT • Single Lane Roundabout • Displaced Left Turn (CFI) • Multilane Roundabout • Continuous Green-T • RCUT • Jughandle • RIRO w/Downstream U-Turn • Diamond Interchange (signal) • High-T (unsignalized) • Quadrant Roadway • Offset-T Intersections • Diverging Diamond • Diamond Interchange (Stop) • Single Point Interchange • Diamond Interchange (RAB) • Turn Lane Improvements • Turn Lane Improvements • Other Intersection Control Evaluation Deliver a transportation -
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.