Geometric Design of Junctions (priority junctions, direct accesses, roundabouts, grade separated and compact grade separated junctions) dn-geo-03060
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TII Publications DN-GEO-03060 Geometric Design of Junctions (priority junctions, direct accesses, roundabouts, grade separated and compact grade separated junctions) April 2017 Page vi 5.6 Geometric Design of Priority Junctions on Single and Dual Carriageway Roads .......................................................................................................................... 43 5.7 Diverging/Merging Tapers and Lanes at Junctions ........................................... 57 5.8 Priority Junctions on climbing lanes .................................................................. 57 5.9 Drainage and Crossfall ..................................................................................... 57 5.10 Roads with Hard Shoulders .............................................................................. 57 5.11 Specific Geometric Design Layouts for Dual Carriageways .............................. 59 6. Geometric Design of Roundabouts ......................................................................... 62 6.1 General ............................................................................................................. 62 6.2 Siting ................................................................................................................. 62 6.3 Landscaping within a Roundabout .................................................................... 63 6.4 Selection of Roundabout Type ......................................................................... 64 6.5 Provision for Non-Motorised Users (NMUs) ...................................................... 65 6.6 Geometric Design of Roundabouts ................................................................... 66 6.7 Visibility ............................................................................................................. 84 6.8 Crossfall ............................................................................................................ 89 6.9 Road Marking and Signing ............................................................................... 92 6.10 Kerbing and Verge Width .................................................................................. 93 6.11 Heavy Goods Vehicles ..................................................................................... 95 6.12 Segregated Left Turn Lanes at Roundabouts ................................................... 95 7. Layout of Grade Separated Junctions ................................................................... 105 7.1 General Principles .......................................................................................... 105 7.2 Design Process............................................................................................... 107 7.3 Layout Options ............................................................................................... 107 7.4 Design Principles ............................................................................................ 109 7.5 Merges – General Principles .......................................................................... 109 7.6 Diverges – General Principles ........................................................................ 116 7.7 Geometric Design Parameters ....................................................................... 121 7.8 Successive Merges or Diverges Within Interchanges ..................................... 122 7.9 Designing Weaving Sections .......................................................................... 126 7.10 Traffic Flows ................................................................................................... 131 7.11 Geometric Standards ...................................................................................... 132 7.12 Loops .............................................................................................................. 135 7.13 Sight Distances ............................................................................................... 139 7.14 Hardstrip and Hardshoulder ............................................................................ 139 TII Publications DN-GEO-03060 Geometric Design of Junctions (priority junctions, direct accesses, roundabouts, grade separated and compact grade separated junctions) April 2017 Page vii 7.15 Lane Drop/Lane Gain and Through Carriageway ........................................... 143 7.16 Interchanges ................................................................................................... 144 7.17 General ........................................................................................................... 147 7.18 Safety ............................................................................................................. 149 8. Layout of Compact Grade Separated Junctions .................................................. 150 8.1 Design Procedure ........................................................................................... 150 8.2 Geometric Standards ...................................................................................... 151 8.3 Layout Options ............................................................................................... 155 8.4 Safety ............................................................................................................. 161 8.5 Specific Road User Requirements .................................................................. 162 9. References ............................................................................................................... 163 9.1 TII Publications (Standards) ........................................................................... 163 9.2 Transport Infrastructure Ireland Publications .................................................. 163 9.3 Traffic Sign Regulations .................................................................................. 163 9.4 UK, Design Manual for Roads and Bridges Standards ................................... 163 ..................................................................................................................... 165 Design Vehicles ........................................................................................................ 165 ..................................................................................................................... 168 Design of Channelising Islands ................................................................................. 168 ..................................................................................................................... 179 Design of a Compound Curve ................................................................................... 179 ..................................................................................................................... 181 Junction Analysis Procedure Worked Example ......................................................... 181 Yüklə 8,57 Mb. 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