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( Reaffirmed 1997 ) IS : 7537 1974 Indian Standard SPECIFICATION FORROAD TRAFFIC SIGNALS Illuminating Engineering Sectional Committee, ETDC 45 ChairmanRepresenting SHRI V. A. KRISIINAMURTHP Central Public Works Department, New Delhi Members SURVEYOR OF WORKS III (ELECT)(Alternate toShri V. A. Krishnamurthy) SHRI P. K. BANDYOPADHYAYPhilips India Ltd, BombaySHRI B. G. DESHPANDE Alternate)SHRI G. R. BHATIADirectorate General of Supplies & Disposals,New DelhiSHRI J. S. PASSI (Alternate) WC-CDR H. S. BHATIADirectorate of Technical Development & Produc-tion (Air) (Ministry of Defence), New DelhiSHRI N. C. GUHA (Akwzale) CHIEFELECTRICAL NGINEER, ORTH- Railway Board (Ministry of Railways) ERN FLAILWAY SHRI D. S. DOSHIBajaj Electricals Ltd, BombaySHRI JAGDISHSHARAN (/llternate)SHRI M. P. GUPTACrompton Greavt=s Ltd, BombaySI~RI S. F. MEHTA (Alkwmte) SIIRI M. P. GUPTAIndian Enginrering Association, Calcutta SHRI G. s. ~HANURASEK1iF.RAl&&?) SHRI T. S. KUMARCentral Mining Research Station (CSIR), Dhanbad SFIRI U. S. NICAM (Aknafe) SHRI B. H. MIIATKE Bombay Elertric Supply & Transport Undertaking,BombaySHRI H. B. NAIK (Al/erna/e) SS~RIB. K. MUKHER,JEENational Test House, CalcuttaSHRI G. BHATTACIIARYYA Alternate) SHRI K. N. NADCIREnginrer-in-Chief’s Branch, Army HeadquartersSHRI .J. R. PARIGeneral Electric Co of India Ltd, CalcuttaSHRI B. CUNNINGHAM (Alternate) SHRI K. S. SARMANational Physical Laboratory (CSIR), New DelhiSHRI H. SINHABharat Electrical Industries Ltd. CalcuttaSHRI H. SINHAIlluminating Engineering Society’of India, Calcutta SHRI K. K. ROHATGI (Alternate)(Continued on #age 2)0 Copyright 1975 INDIAN STANDARDS INSTITUTION This publication is protected under the Indian Copyright Act (XIV of 1957) andreproduction in whole or in part by any means except with written permission of thepublisher shall be deemed to be an infringement of copyright under the said Act. IS : 7537 1974 (Continued rom page 1) MembersRepresentingSHRI P. R. SURENDRANATHANDirectorate General of Factory Advice Service &Labour Institutes (Ministry of Labour, Em-ployment & Rehabilitation), Bombay SHRI S. PURUSHOTTAM (Alternate) SHRI N. SRINNASAN, Director General, IS1 (Ex-oficio Member)Director (Elec tech) Secretary SHRI T. RAJARAMANDeputy Director (Elec tech), IS1 Panel for Road Traffic Signals, ETDC 45 : P7 Convener DR N. S. SRINIVASAN Members Central Road Research Institute (CUR), NewDelhi SHIU JOGINDERLAL (Alternate toDr N. S. Srinivasan)SHRI B. K. CHAWLA Central Public Works Department, New DelhiSHRI K. H. GODHWANI (Alternate) EXEC~TNE ENGINEER (TRAFFIC Co- Municipal Corporation of Greater Bombay,ORDINATION) Bombay SHRI S. &PuR Philips India Ltd, Bombay SHRIP.K.BANDYOPADHYAY (Alternate) SHRI A~HOK KHANNA Controls & Switchgear Company, New DelhiSHRI R. N. KHANNA (Alternate) SHRI M. S. KOHLI Envoys (India) Pvt Ltd, New DelhiSHRI G. S. MANDERSuperintendent of Police, Traffic, New Delhi SHRI G. SAMSONSHRI R. RATNAKAR (Alternate) Indian Telephone Industries Ltd, Bangalore SHRI K. S. SARMA National Physical Laboratory (CSIR), New Delhi IS :_7537 - 1974 Indian Standard SPECIFICATION FORROAD TRAFFIC SIGNALS 0. FOREWORD 0.1 This Indian Standard was adopted by the Indian Standards Institutionon 2 1 November 1974, after the draft finalized by the Illuminating Engi-neering Sectional Committee had been approved by the ElectrotechnicalDivision Council.0.2 This Indian Standard has been prepared in response to a request fromthe Study Group on Road Safety of the Government of India. While formu-lating this standard the need for specifying higher optical requirementswhich recent research by the Road Research Laboratories has shown to beessential for modern traffic systems control, has been kept in view.0.3 The Committee responsible for the preparation of this standard tookcognisance of the effect of transmitted vibration due to traffic on roadtraffic signals and felt that at the moment it was not possible to exactlyspecify requirements in this regard and that manufacturers should takeadequate care in the design of the equipment by providing means, such asanti-vibration mount.0.4 In preparing this standard assistance has been derived from B.S. 505-1971 ‘Road traffic signals’, published by British Standards Institution.0.5 For the purpose of deciding whether a particular requirement of thisstandard is complied with, the final value, observed or calculated, expressingthe result of a test or analysis, shall be rounded off in accordance withIS : 2-1960”.The number of significant places retained in the rounded offvalue should be the same as that of the specified value in this standard. 1. SCOPE1.1 This standard specifies requirements for fixed and portable electriclight signal installations operated from mains, generator or battery supplyfor controlling road traffic. It also includes reference to operationalrequirements for the signals and their controller.1.2 The information which should be given with enquiries and orders forequipment is covered in Appendix A.*Rules for roundingoff numericalvalues (revised). 3
