11/87 (A Guide to the Design of At-Grade Interchange)

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Contents

Preface

C13 AT(J) 11-87 A Guide To The Design Of At - Grade Intersection.pdf
This Arahan Teknik (Jalan) on "A Guide To The Design Of At-Grade Intersections" replaces "Interim Guide To Junction Design - JKR/J(Rb)0019/82" Which was published in August 1982. It is to be used for the geometric design of all at-grade intersections (whether new or improvements) and is to be used in conjunction with Arahan Teknik (Jalan) 8/86- "A Guide To Geometric Design Of Roads", Arahan Teknik (Jalan) 13/87 - "A Guide To Traffic Signal Design" and other relevant Arahan Tekniks.
While the geometric standards indicated in this Arahan Teknik is to be followed at all times, it is recognised that in some instances, due to site constraints or otherwise, the required standards may not be attainable exoept at a prohibitive cost. In such instances, the engineer/consultant should refer to his superior/client for a final deoision, although the concepts of safety and design expressed in this Arahan Teknik (Jalan) should always be maintained.
The engineer is encouraged to study the various references as indicated in the Appendix to fully understand some of the concepts and approaches adopted in this Arahan Teknik (Jalan).
This Arahan Teknik (Jalan) will be updated from time to time and in this respect any feedback from users will be most welcome. Any comments should be sent to Cawangan Jalan, Ibu Pejabat JKR.


Contents

CHAPTER 1 : PRINCIPLES OF DESIGN

  • General
  • Types of Conflicting Manoeuvers
  • Types of At-Grade Intersect ion Layouts
  • Factors Influencing Design
  • Safety
  • Points of Conflict
  • Area of Conflict
  • Major Movements
  • Control of Speed
  • Traffic Control and Geometric Design
  • Capacity
  • Location of Intersect ion
  • Spacing of Intersections
  • Channelisation
  • Excessive Channellisation


CHAPTER 2 : DESIGN CONTROLS

  • Priority Control
  • Traffic
  • Design Speed
  • Design Vehicles
  • Selection of Intersection Type
  • Combination and Coordination in Successive Intersections


CHAPTER 3 : GEOMETRIC STANDARDS

  • General
  • Horizontal Alignment
  • Vertical Alignment
  • Sight Distance
  • Right Turn Lanes
  • Left Turn Lanes
  • Pavement Tapers
  • Auxiliary Lanes
  • Islands and Openings
  • Widening of Major Road
  • Minor Road Treatment
  • Shoulders
  • Crossfall and Surface Drainage 


CHAPTER 4 : CAPACITY OF INTERSECTIONS

  • General
  • Level of Service
  • Capacity of Unsignalised Intersection
  • Capacity of Signalised Intersection
  • Capacity of Roundabouts


CHAPTER 5 : OTHER RELATED ELEMENTS

  • Pedestrian Facilities
  • Lighting
  • Public Utilities
  • Parking
  • Traffic Signs and Lane Markings
  • Drainage
  • Landscaping
  • Stop Line


APPENDICES

  • APPENDIX A - GENERAL WARRANTS FOR TRAFFIC CONTROLLED SIGNALS
  • APPENDIX B - WORKSHEETS FOR CAPACITY CALCULATIONS OF UNSIGNALISED INTERSECTIONS
  • APPENDIX C - USEFUL REFEREOCE FIGURES
  • APPENDIX D - EXAMPLE CALCULATIONS FOR CAPACITY OF UNSIGNALISED INTERSECTIONS
  • APPENDIX E - LIST OF REFERENCES


FIGURES

  • Desirable separation of staggered T-junctions
  • Intersection sight triangle
  • Sight distance at intersections (minimum sight triangle)
  • Sight distance at intersection data or acceleration from stop
  • Sight distance at intersections
  • Effect of skew
  • Effect of grade on stopping sight distance, wet conditions
  • Correction factor for the effect of grade on acceleration time ta
  • Right-turn lanes
  • Seagull island
  • Right-turn clearance
  • Island areas
  • Turning radius
  • Design of separate left-turn lanes
  • Types of taper
  • Length of deceleration lanes
  • Correction for grade
  • Treatment in approach to left turns
  • Length of acceleration lanes
  • Correction for grade
  • Treatment for acceleration lane taper
  • Directional island
  • Offset to median island
  • End treatment for narrow medians
  • Median terminal treatments
  • Painted island
  • Median opening
  • One-way entrance to a service road, etc.
  • Widening by S-curves
  • Standard design of guide island A
  • Standard design of guide island B
  • Definition and computation of conflicting traffic volumes
  • Potential capacity based on conflicting traffic volume and critical gap size
  • Impedance factors as a result of congested movements
  • Illustration of impedance calculations
  • Notation for capacity calculation (roundabout)
  • Typical lane and pavement markings


TABLES

  • Desirable minimum spacings of intersections
  • Desirable vehicles for Intersection design
  • Selection of Intersection type A
  • Selection of Intersection type B
  • Sight distance for Intersection approach
  • Minimum design speeds for left-turn channel
  • Lane widths for left-turn lane
  • Minor road treatment
  • Level of service
  • Conversion to P.C.U. for unsignalised intersection
  • Critical gap size selection
  • Level of service criteria for unsignalised intersection
  • Level of service criteria for signalised intersection