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DN-GEO-03031 June 2017 TRANSPORT INFRASTRUCTURE IRELAND (TII) PUBLICATIONS Rural Road Link Design DN-GEO-03031 June 2017 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). 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. TII Publication Title Rural Road Link Design TII Publication Number DN-GEO-03031 Activity Design (DN) Document Set Standards Stream Geometry (GEO) Publication Date June 2017 Document 03031 Historical NRA TD 9 Number Reference TII Publications Website This document is part of the TII publications system all of which is available free of charge at http://www.tiipublications.ie. For more information on the TII Publications system or to access further TII Publications documentation, please refer to the TII Publications website. TII Authorisation and Contact Details This document has been authorised by the Director of Professional Services, Transport Infrastructure Ireland. For any further guidance on the TII Publications system, please contact the following: Contact: Standards and Research Section, Transport Infrastructure Ireland Postal Address: Parkgate Business Centre, Parkgate Street, Dublin 8, D08 DK10 Telephone: +353 1 646 3600 Email: [email protected] TRANSPORT INFRASTRUCTURE IRELAND (TII) PUBLICATIONS TII Publications Activity: Design (DN) Stream: Geometry (GEO) TII Publication Title: Rural Road Link Design TII Publication Number: DN-GEO-03031 Publication Date: June 2017 Set: Standards Contents Foreword .............................................................................................................................. 1 1. Design Speed .............................................................................................................. 5 2. Sight Distance ........................................................................................................... 14 3. Horizontal Alignment ................................................................................................ 19 4. Vertical Alignment ..................................................................................................... 29 5. Climbing Lanes ......................................................................................................... 33 6. Introduction to Coordinated Link Design ................................................................ 43 7. Two-Way Single Carriageway Roads ....................................................................... 46 8. Dual Carriageways and Motorways ......................................................................... 61 9. Express Roads .......................................................................................................... 73 10. Two-Way Single Carriageway Rural Roads –Regional and Local Roads ............. 74 11. Geometric Design to Enhance Surface Drainage of Carriageways ...................... 80 12. References ................................................................................................................. 91 ....................................................................................................................... 92 Harmonic Mean Visibility ............................................................................................. 92 ....................................................................................................................... 95 Worked Example – calculation of water film depth ...................................................... 95 Page i TII Publications DN-GEO-03031 Rural Road Link Design June 2017 Updates to TII Publications resulting in changes to Rural Road Link Design DN-GEO-03031 Date: June 2017 Amendment Details: This Standard supersedes DN-GEO-03031 dated April 2017. The principle changes from the previous standard are: a) Section 7.5 Non-overtaking Crests has been clarified to state that where Desirable Minimum crest curves have a length greater than FOSD/2, the Overtaking Section shall terminate at the vertical tangent point of the Desirable Minimum Crest curve. b) Figure 7.5 has been amended for clarity in terms of the direction of travel and the commencement and termination of overtaking sections. c) The Figure and Table numbering and references in Chapter 10 have been corrected. Date: September 2017 Amendment Details: The following minor amendment has been incorporated into the June 2017 version of this Standard: a) Incorrect document reference in Section 1.8.2 d) has been corrected. Page ii TII Publications DN-GEO-03031 Rural Road Link Design June 2017 Date: May 2019 Amendment Details: This Standard supersedes DN-GEO-03031 dated April 2017. The principle changes from the previous standard are: a) Incorrect section reference in Table 10.3 has been corrected. Page iii TII Publications DN-GEO-03031 Rural Road Link Design June 2017 Contents Table Foreword .............................................................................................................................. 1 1. Design Speed .............................................................................................................. 5 1.1 Factors affecting speed ...................................................................................... 5 1.2 Selection of Design Speed ................................................................................. 6 1.3 Design Speed Related Parameters .................................................................... 9 1.4 Design Speed for Cyclist .................................................................................. 10 1.5 Changeover of Design Speed Standards ......................................................... 10 1.6 Connection to Existing Roads ........................................................................... 10 1.7 Selection of Parameter Values ......................................................................... 10 1.8 Relaxations ....................................................................................................... 10 1.9 Departures ........................................................................................................ 13 2. Sight Distance ........................................................................................................... 14 2.1 Stopping Sight Distance ................................................................................... 14 2.2 Full Overtaking Sight Distance ......................................................................... 14 2.3 Coordinated Design of Single Carriageways .................................................... 15 2.4 Obstructions to Sight Distance ......................................................................... 15 2.5 Sight Distance for Cyclists ................................................................................ 15 2.6 Relaxations in Sight Distance ........................................................................... 16 3. Horizontal Alignment ................................................................................................ 19 3.1 Road Camber ................................................................................................... 19 3.2 Superelevation .................................................................................................. 19 3.3 Horizontal Alignment for Cycle Facilities ........................................................... 20 3.4 Desirable Minimum Radius ............................................................................... 20 3.5 Relaxations in Horizontal Alignment ................................................................. 21 3.6 Length of Superelevation Development ............................................................ 21 3.7 Application of Superelevation ........................................................................... 22 3.8 Widening on Curves ......................................................................................... 22 3.9 Lane Width Reductions at Pinch Points ............................................................ 23 3.10 Transitions ........................................................................................................ 23 3.11 Horizontal Broken Back Curves ........................................................................ 24 3.12 The Effect of Sight Distance at Horizontal Curves ............................................ 26 3.13 Rate of Change of Cross-Section Width ........................................................... 26 4. Vertical Alignment ..................................................................................................... 29 4.1 Gradients for Motorised Vehicles ...................................................................... 29 Page iv TII Publications DN-GEO-03031 Rural Road Link Design June 2017 4.2 Gradients for Cycle Facilities ...........................................................................
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