LRT Design Criteria
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LRT Design Criteria THIS DOCUMENT WAS THE CURRENT REVISION WHEN ISSUED IN HARD COPY, CHECK THE ELECTRONIC FILE ON THE SANDAG WEBSITE TO ASSURE YOU HAVE THE CURRENT REVISION PRIOR TO USE. THIS PAGE INTENTIONALLY LEFT BLANK LRT Design Criteria Manual Revision Record REVISION RECORD LRT DESIGN CRITERIA MANUAL REV. REV. SECTION (S) NO DATE AFFECTED COMMENTS 0 3/14/14 All Initial Issue March 2014 LRT Design Criteria Manual Table of Contents Table of Contents 1.0 SPECIAL CIVIL WORK FOR LRT .............................................................................. 1-1 1.1 Drainage .......................................................................................................... 1-1 1.1.1 Project Hydrology ................................................................................. 1-1 1.1.2 Drainage Discharge in Trackway .......................................................... 1-1 1.1.2.1 Ballasted Track ................................................................... 1-1 1.1.2.2 Grade Crossings ................................................................. 1-2 1.2 Utilities for LRT ................................................................................................ 1-2 1.2.1 Traction Power Requirements .............................................................. 1-2 1.2.2 Design Requirements for Underground Utilities ................................... 1-2 1.2.3 Risk Assessment .................................................................................. 1-2 1.3 Right-of-Way Requirements for LRT ................................................................ 1-2 1.3.1 At-Grade Construction .......................................................................... 1-2 1.3.1.1 General ............................................................................... 1-2 1.3.1.2 Height Limits ....................................................................... 1-3 1.3.1.3 Lateral Limits ....................................................................... 1-3 1.3.2 Aerial Construction ............................................................................... 1-3 1.3.3 Drainage and Utility Easements ........................................................... 1-3 1.3.4 Traction Power Substations .................................................................. 1-3 1.3.5 Right-of-Way Safety ............................................................................. 1-4 1.3.5.1 Access ................................................................................ 1-4 1.3.5.2 Means of Egress ................................................................. 1-4 2.0 LRT STATIONS .......................................................................................................... 2-1 2.1 Site Layout ....................................................................................................... 2-1 2.1.1 Platform General Circulation and Access ............................................. 2-1 2.1.2 Bus and Parking Circulation Access ..................................................... 2-1 2.2 Service Access ................................................................................................ 2-2 2.3 Platform Geometry ........................................................................................... 2-2 2.3.1 Platform Length .................................................................................... 2-2 2.3.2 Platform Height..................................................................................... 2-2 2.3.3 Platform Width ...................................................................................... 2-2 2.3.4 Grade ................................................................................................... 2-3 2.4 Station Amenities ............................................................................................. 2-5 March 2014 i LRT Design Criteria Manual Table of Contents 2.4.1 Shelters ................................................................................................ 2-5 2.4.2 Public Information Communications ..................................................... 2-5 2.4.2.1 Signs - General ................................................................... 2-5 2.4.2.2 Signs - Track ID .................................................................. 2-7 2.4.2.3 Station Identification Signs .................................................. 2-7 2.4.2.4 Tactile Signs ....................................................................... 2-7 2.4.2.5 Fare Paid Zone Signs ......................................................... 2-7 2.4.2.6 Advance Station Signs ........................................................ 2-7 2.4.2.7 Miscellaneous Directional Signs .......................................... 2-7 2.4.2.8 Variable Messaging System (See Section 6.9) and Public Address (See Section 6.8) ........................................ 2-7 2.4.2.9 Transit Next Bus Messaging System (TNBMS) ................... 2-7 2.4.2.10 Information Sign Frames ..................................................... 2-7 2.5 Fare Collection (See Fare Collection Technology, Section 6.10) ...................... 2-8 2.6 Station System (See Communications, Chapter 6.0) ....................................... 2-8 2.7 Electrical .......................................................................................................... 2-8 2.7.1 General ................................................................................................ 2-8 2.7.2 Electrical Service .................................................................................. 2-8 2.7.3 Electrical Distribution System ............................................................... 2-9 2.7.3.1 Panelboards ...................................................................... 2-10 2.7.3.2 Circuit Breakers ................................................................ 2-10 2.7.3.3 Conduits ............................................................................ 2-10 2.7.3.4 Pull Boxes ......................................................................... 2-10 2.7.3.5 Conductors and Cables ..................................................... 2-11 2.7.3.6 Miscellaneous Electrical Equipment .................................. 2-11 2.7.4 Grounding .......................................................................................... 2-11 2.7.5 Lighting .............................................................................................. 2-12 2.7.5.1 General ............................................................................. 2-12 2.7.5.2 Contactors and Controls ................................................... 2-12 2.7.6 Utilization Voltages ............................................................................. 2-12 2.8 Ventilation for Subterranean Station .............................................................. 2-13 2.9 Fire Protection, Alarm, and Emergency Management Systems ...................... 2-13 2.10 Fire/Life Safety (Elevated or Underground Station) ........................................ 2-15 ii March 2014 LRT Design Criteria Manual Table of Contents 3.0 TRACKWORK ............................................................................................................ 3-1 3.1 Alignment and Clearance ................................................................................. 3-1 3.1.1 General ................................................................................................ 3-1 3.1.1.1 Alignment ............................................................................ 3-1 3.1.1.2 Clearance ........................................................................... 3-2 3.1.2 Horizontal Alignment ............................................................................ 3-2 3.1.2.1 Horizontal Clearances ......................................................... 3-2 3.1.2.2 Minimum Clearances .......................................................... 3-2 3.1.2.3 Standard Clearances .......................................................... 3-2 3.1.2.4 Adjustments ........................................................................ 3-5 3.1.2.5 Emergency Walkways ......................................................... 3-5 3.1.3 Tangent Alignment ............................................................................... 3-6 3.1.4 Curved Alignment ................................................................................. 3-6 3.1.4.1 Circular Curves ................................................................... 3-6 3.1.4.2 Minimum Radii .................................................................... 3-9 3.1.4.3 Minimum Length of Circular Curve ...................................... 3-9 3.1.4.4 Spiral Transition Curves ...................................................... 3-9 3.1.4.5 Minimum Length ................................................................. 3-9 3.1.4.6 Curves without Spirals ...................................................... 3-10 3.1.4.7 Compound Circular Curves ............................................... 3-10 3.1.4.8 Superelevation .................................................................. 3-12 3.1.5 Vertical Alignment .............................................................................. 3-13 3.1.6 Vertical Grade .................................................................................... 3-14 3.1.6.1 Grade Rates and Lengths ................................................. 3-14 3.1.6.2