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DN-GEO-03035 January 2009

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DN-GEO-03035 January 2009 Layout of Grade Separated Junctions DN-GEO-03035 January 2009 Withdrawn DN Design Standards TRANSPORT INFRASTRUCTURE IRELAND (TII) PUBLICATIONS About TII Transport Infrastructure Ireland (TII) is responsible for managing and improving the country’s national road and light rail networks. About TII Publications TII maintains an online suite of technical publications, which is managed through the TII Publications website. The contents of TII Publications is clearly split into ‘Standards’ and ‘Technical’ documentation. All documentation for implementation on TII schemes is collectively referred to as TII Publications (Standards), and all other documentation within the system is collectively referred to as TII Publications (Technical). This system replaces the NRA Design Manual for Roads and Bridges (NRA DMRB) and the NRA Manual of Contract Documents for Road Works (NRA MCDRW). Document Attributes Each document within TII Publications has a range of attributes associated with it, which allows for efficient access and retrieval of the document from the website. These attributes are also contained on the inside cover of each current document, for reference. For migration of documents from the NRA and RPA to the new system, each current document was assigned with new outer front and rear covers. Apart from the covers, and inside cover pages, the documents contain the same information as previously within the NRA or RPA systems, including historical references such as those contained within NRA DMRB and NRA MCDRW. Document Attributes TII Publication Title Layout of Grade Separated Junctions TII Publication DN-GEO-03035 Number Activity Design (DN) Document Set Standards Stream Geometry (GEO) Publication Date January 2009 Document 03035 Historical TD 22 Number Reference NRA DMRB and MCDRW References For all documents that existed within the NRA DMRB or the NRA MCDRW prior to the launch of TII Publications, the NRA document reference used previously is listed above under ‘historical reference’. The TII Publication Number also shown above now supersedes this historical reference. All historical references within this document are deemed to be replaced by the TII Publication Number. For the equivalent TII Publication Number for all other historical references contained within this document, please refer to the TII Publications website. National Roads Authority Volume 6 Section 2 Design Manual for Roads and Bridges Part 1 TD 22/06 Addendum NRA ADDENDUM TO TD 22/06 LAYOUT OF GRADE SEPARATED JUNCTIONS This Addendum supersedes the NRA Addendum dated January 2005 to Standard TD 22/92. The revisions have arisen with the publication of Standard TD 22/06 and this Addendum amends the scope of TD 22/06 for use in Ireland. Standard TD 22/06 – Layout of Grade Separated Junctions – is applicable in Ireland with the following amendments: GENERAL At several locations: For: “LGV” Read: “LCV” For: “highway” Read: “road” For: “TD 9 (DMRB 6.1.1)” Read: “NRA TD 9” Jan 2009 1 National Roads Authority Volume 6 Section 2 Design Manual for Roads and Bridges Part 1 TD 22/06 Addendum SPECIFIC Chapter 1, Introduction 1. Page 1/1, Paragraph 1.1, first sentence: Delete “on rural and urban trunk roads and motorways” and replace with: “on Motorways and Type 1 Dual Carriageway National Roads” 2. Page 1/1, Paragraph 1.4: For: “v. Introduction of the ghost island diverge layout (“tiger tail”).” Read: “v. Not used.” 3. Page 1/1, Paragraph 1.4: For: “viii. Revised requirements for determining hourly traffic flows for design.” Read: “viii. Not used.” 4. Page 1/1, Paragraph 1.4, at end of sub-paragraphs add: xiv. Defines the term dumb-bell link road. xv. Removes the option for a two lane taper diverge. xvi. New merging and diverging diagrams. xvii. Introduces the use of a Single Lane Parallel Diverge with associated details. xviii. New rules for crossfall on merges and diverges. xix. Revised guidance on the lighting policy of grade separated junctions. 5. Page 1/1 Paragraph 1.5, line 4: For : “trunk roads and motorways” Read: “Motorways and Type 1 Dual Carriageway National Roads” 6. Page 1/1 Paragraph 1.5, lines 17 and 18, Delete “Traffic Signs Regulations and General Directions (TSGRD), the Traffic Signs Manual, DMRB Volumes 8 and 9 and Local Transport Note 1/94.” and replace with: “Traffic Signs Manual and DMRB Volumes 8 and 9.” 7. Page 1/1: Delete Paragraph 1.6 and replace with: “1.6 This Standard must be used forthwith for the design of all schemes for the construction and/or improvement of Motorways or Type 1 Dual Carriageway National Roads. This Jan 2009 2 National Roads Authority Volume 6 Section 2 Design Manual for Roads and Bridges Part 1 TD 22/06 Addendum Standard should be applied to the design of schemes already being prepared unless, in the opinion of the National Roads Authority, application would result in significant additional expense or delay progress. In such cases, the Design Organisation should confirm the application of this Standard to particular schemes with the National Roads Authority.” 8. Page 1/2, after Paragraph 1.12, add paragraph; “1.12A Dumb-bell Link Road: A short link road connecting two roundabouts either side of a dual carriageway or motorway at an interchange.” 9. Page 1/2, Paragraph 1.14, line 5: Delete “At a diverge it is to separate the points of exit to a slip road.” 10. Page 1/2, Paragraph 1.14, line 7: For: “See Figures 2/4.4F, 2/6.1B Option 1 and 2/6.3D Option 1.” Read: “See Figure 2/4.4F. 11. Page 1/2, Paragraph 1.19 delete “Large Goods Vehicle (LGV”) and replace with: “Large Commercial Vehicle (LCV)” 12. Page 1/2, delete paragraph 1.26. 13. Page 1/3, delete paragraph 1.29 and replace with: “1.29 Roads: Urban and Rural: an Urban Road is a road which is in a built up area and has either a single carriageway with a speed limit of 60 km/h or less, or has a dual carriageway (excluding motorways) with a speed limit of 80 km/h or less, or a motorway with a speed limit of 100 km/h or less. All other roads are Rural Roads.” 14. Page 1/3, paragraph 1.30, line 5: For: “give way” Read: “yield” 15. Page 1/3, delete paragraph 1.32. 16. Page 1/3, delete paragraph 1.34. 17. Page 1/3, delete paragraph 1.35. 18. Page 1/3, Paragraph 1.37, Line 4 delete “Overseeing Organisation” and replace with: “National Roads Authority” Jan 2009 3 National Roads Authority Volume 6 Section 2 Design Manual for Roads and Bridges Part 1 TD 22/06 Addendum 19. Page 1/3, Paragraph 1.38 first line, lines 8 and 11, delete “Overseeing Organisation” and replace with: “National Roads Authority” 20. Page 1/3, Paragraph 1.39 add at end: “Design aspects with Relaxations are considered to conform to standards.” Chapter 2, Design Procedure 21. Page 2/1, Paragraph 2.8, line 4: For: “all-purpose” Read: “a Type 1 Dual Carriageway National Road” 22. Page 2/2, Figure 2/1: For: “All-Purpose or Motorway”. Read: “Motorway or Type 1 Dual Carriageway National Road” 23. Page 2/3, Paragraph 2.10, sub-paragraph (ii), delete “Traffic Signs Manual, Chapter 4” and replace with: “(Traffic Signs Manual)” 24. Page 2/3, Paragraph 2.14, Line 6: For: “Motorway or All-Purpose”. Read: “Motorway or Type 1 Dual Carriageway National Road” 25. Page 2/4, Paragraph 2.19, line 4: For: “TSGRD” Read “Traffic Signs Manual” 26. Page 2/4, Paragraph 2.23, Second line, delete “large goods vehicles” and replace with: “large commercial vehicles” 27. Page 2/5, Figure 2/2, sixth box down, delete “AP or MW (Tables 3/1a and 3/1b. TD27 (DMRB 6.1.2) and Paragraph 3.5” and replace with: “Type 1 Dual Carriageway National Road or Motorway (see Table 3/1 and NRA TD 27 (DMRB 6.1.2) Tables 2 to 5” 28. Page 2/5, Figure 2/2, Section of flow chart dealing with diverges: Delete box containing text: “Check widths of any ghost islands (see Paragraph 2.53)” 29. Page 2/6, Paragraph 2.30, delete first part of the paragraph: “Where, for reasons of route continuity, the mainline capacity provided is in excess of the design flows and a merging design Jan 2009 4 National Roads Authority Volume 6 Section 2 Design Manual for Roads and Bridges Part 1 TD 22/06 Addendum flow of over one lane capacity is expected, then layout C of Figure 2/4.2 may be substituted for layout F of Figure 2/4.4, but normally, with such a large flow expected to merge, a lane would be added to the mainline. For layout C the meaning of „where design flows on the mainline are light‟ (see Figure 2/4.2) is that there is sufficient capacity on the mainline to accept the flow from the slip road.” 30. Page 2/6, Paragraph 2.30, at end of Paragraph 2.30 insert: “The Single Lane Taper Merge (Layout A) shall not be used.” 31. Page 2/6, Paragraph 2.31, line 2: For: “TSGRD diagram 1042.1” Read “the Traffic Signs Manual” 32. Page 2/6, Paragraph 2.32, line 3: For: “(TSRGD diagram 1042.1)” Read “(see Traffic Signs Manual)” 33. Page 2/6, delete paragraph 2.35. 34. Page 2/7, Figure 2/3 AP and Page 2/8, Figure 2/3 MW to be replaced with Figure 2/3 reproduced below: Jan 2009 5 National Roads Authority Volume 6 Section 2 Design Manual for Roads and Bridges Part 1 TD 22/06 Addendum Figure 2/3: Merging Diagram Jan 2009 6 National Roads Authority Volume 6 Section 2 Design Manual for Roads and Bridges Part 1 TD 22/06 Addendum 35.
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