AACRA Street Lighting Manual

AACRA Street Lighting Manual
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   GUIDELINE 7  AACRA STREET LIGHTING DESIGN MANUAL FINAL - November 2004 Section 1 – Introduction Page 1-1 1   INTRODUCTION 1.1 Addis Ababa City Roads Authority The Addis Ababa City Roads Authority (AACRA) was established by the Addis Ababa City Government in 1998. The role of AACRA is to plan, construct and maintain the city road network including the street lighting. 1.2 Contractors to AACRA In some cases private developers contract to construct roads in new areas of the City. These roads are handed over to AACRA to maintain. In accordance with AACRA Legislative Framework  AACRA has the power to require that the private developer must construct the roads and all related facilities, including street lighting, in accordance with AACRA requirements and under AACRA supervision. 1.3 Legislative Framework The Addis Ababa City Roads Authority Establishment Regulations No7/1998  defines the powers and duties of the AACRA. These regulations include powers with respect to road/street lighting. The powers with respect to street lighting include, but are not limited to: a) Initiate policies and laws with regard to road network, construction, protection and use of roads. b) Determine design standards for roads and implement same. c) Construct roads on its own or have them constructed through contractors. d) Determine standards give permit and supervise roads to be constructed by the society, by groups or by private individuals, by governmental or non governmental organizations; and, where necessary, it shall, in accordance with its own directives, provide appropriate technical & material support. e) Cause the installation and protection of road/street lights. 1.4 Objectives The objectives of the preparation of a Street Lighting Design Manual include: a) To provide AACRA with design standards. which are in line with current best international practice b) To provide a maintenance framework which will ensure that best performance of the existing and future Street Lighting installations is sustained for the lifetime of the equipment. c) To provide guidelines for cost effective upgrading of the existing street lighting installations.   GUIDELINE 7  AACRA STREET LIGHTING DESIGN MANUAL Section 1 – Introduction FINAL - November 2004 Page 1-2 One key consideration is lighting design to reduce the risk of traffic accidents at night. For comparable traffic volumes, road accidents at night are disproportionately high in numbers and severity compared to daytime. Depending on the road and traffic classification, studies show the accident savings to more than offset the cost of lighting (refer 8.5 Publications of the International Commission on Illumination (CIE) Technical report CIE 93 – 1992).   GUIDELINE 7  AACRA STREET LIGHTING DESIGN MANUAL FINAL - November 2004 Section 2 – Interested Parties Page 2-1 2   INTERESTED PARTIES There are a number of stakeholders who have an interest in street lighting 2.1 Ethiopian Electric Power Corporation (EEPCO) EEPCO supplies all electric power in Ethiopia. Street lighting installations must comply with the safety and metering regulations of EEPCO before power can be connected. EEPCO advised in September 2002 that the tariff for street lighting was currently 0.3970 birr per kilowatt hour. 2.2 EEPCO Historic Role in Street Lighting Before the formation of AACRA, EEPCO had sole responsibility for deciding which streets were to be lit and for design, construction and maintenance of street lighting.  After the formation of AACRA provision of street lighting became the responsibility of AACRA who contracted this work out to EEPCO. Many existing street lights that have become the responsibility of AACRA are mounted on poles, which also carry open wire power distribution systems and therefore remain the property of EEPCO.  AACRA is now charged under its Establishment Regulations with determining and implementing design standards for roads, including Street lighting. 2.3 Other Services in the Road Reserve The location of all other services in the road reserve affects the space that is available for the installation of street lighting and vice versa. Installation of street lighting requires space for poles, cabling and facilities. It also requires coordination with the space needed for other services.  All of the following organizations are interested parties in street lighting because they have facilities located in the road reserve. These facilities may conflict with the space requirements for installation of street of street lighting. Coordination of all these facilities is essential. 2.3.1 Stormwater by AACRA. Provision for storm water drainage requires either open channels or underground piping in the road reserve. 2.3.2 Telephone by Ethiopia Telecommunications Corporation (ETC). Telecommunications services are distributed by both overhead and underground lines, usually in the road reserve. There are minimum clearance requirements to be observed between telecommunications and other electrical services to avoid electrical interference refer Clause 4.10.2.   GUIDELINE 7  AACRA STREET LIGHTING DESIGN MANUAL Section 2 – Interested Parties FINAL - November 2004 Page 2-2 2.3.3 Electrical distribution by EEPCO. EEPCO has an extensive 15 kV and 380 volt distribution system mostly on overhead poles in the road reserve. Clearance requirements between street lighting and electrical distribution systems are discussed in Clause 4.10 Coordination with other services 2.3.4 Water and Sewerage by Addis Ababa Water and Sewerage Authority (AAWSA). Water distribution and sewerage collection pipe work is installed in road reserves by AAWSA. 2.3.5 Traffic Signs by AACRA Traffic signs must not be obscured by the placement of street light poles however there is usually some flexibility in the placement of signs. Traffic signs may be mounted on street light poles if the street lighting poles are in a suitable location. It is recommended that traffic signs including street names are faced with retro-reflective material complying with ASTM D4956-01 Standard Specification for Retro-reflective Sheeting for Traffic Control, so that they will be adequately illuminated by vehicle headlights without the need for supplementary illumination. Where it is not possible to mount traffic signs in a position where they will be illuminated by vehicle headlights, it is recommended that supplementary illumination providing a minimum vertical illuminance of 20 lux should be used. Supplementary illumination may be provided by conventional lights or by solar powered light emitting diodes. An example of commercially available solar powered illuminated signs is shown at reference 8.7.11. 2.3.6 Traffic Light Signals by AACRA Traffic light signals can share a common mounting pole with street lights. Traffic light signals must not be obscured by the placement of street light poles or by the placement of traffic signs. Traffic light signals may be fed by the street lighting power supply network provided that the lighting power supply is switched “ON” 24 hours per day. 2.3.7 Sample Designs for Coordination of Service Locations Sample designs for coordination of space allocation between services are included in concept sketches in The Addis Ababa City Road Network (final draft) April 2002 produced by the Office for the Revision of the Addis Ababa Master Plan (ORAAMP) Further examples are given in reference 8.6.2 The arrangements change in different areas to suit the space available in the footpath for the installation of street lighting cables and other underground services. Underground services, except roadway crossings, are not usually installed directly under the vehicle traffic lanes because of the disruption to traffic that would occur during maintenance and alteration work.
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