council direct februari approxim law member state relat permiss sound level exhaust system motor vehicl eec council european commun regard treati establish european econom commun articl thereof regard propos commiss regard opinion european parliament regard opinion econom social committe technic requir motor vehicl satisfi pursuant nation law relat inter alia permiss sound level exhaust system requir differ member state member state adopt requir addit place exist rule order eec type approv procedur subject council direct februari approxim law member state relat type approv motor vehicl trailer appli respect type vehicl adopt direct articl purpos direct quot vehicl quot mean motor vehicl intend road bodywork wheel maximum design speed exceed kilometr hour except vehicl run rail agricultur tractor machineri public work vehicl articl member state refus grant eec type approv nation type approv vehicl ground relat permiss sound level exhaust system sound level exhaust system satisfi requir set annex articl amend adjust requir annex account technic progress except requir set item adopt accord procedur laid articl council direct type approv motor vehicl trailer articl member state put forc provis requir need order compli direct eighteen month notif forthwith inform commiss thereof member state ensur text main provis nation law adopt field cover direct commun commiss articl direct address member state brussel februari council presid harmel oj oj oj annex permiss sound level limit sound level vehicl refer articl direct measur condit set annex exce level gt pic file quot quot gt measur instrument nois emit vehicl measur mean sound level meter type public st edit intern electrotechn commiss condit measur measur made unladen vehicl suffici silent open area ambient nois wind nois db nois measur area form instanc open space metr radiu central part metr radiu practic level surfac concret asphalt similar materi cover powderi snow tall grass loos soil ash surfac test track excess tyre nois condit appli measur nois made vehicl motion measur carri fine weather wind person observ take read apparatu remain vehicl microphon presenc spectat vehicl microphon consider affect read apparatu mark fluctuat pointer unrel characterist gener sound level take read method measur measur nois vehicl motion type approv measur made side vehicl preliminari measur made adjust purpos disregard microphon situat metr ground level distanc metr path vehicl centr line cc measur perpendicular pp quot line figur line aa quot bb quot parallel line pp quot situat metr forward metr rearward line mark test track vehicl approach line aa quot steadi speed throttl fulli open rapidli practic held fulli open posit rear vehicl cross line bb quot throttl close rapidli maximum sound level record constitut result measur vehicl gearbox vehicl approach line aa quot steadi speed lowest speed engin speed equal quarter engin speed engin develop maximum power engin speed equal quarter maximum engin speed permit governor kilometr hour vehicl manual oper gearbox gear gearbox engag vehicl fit speed speed speed gearbox gear gearbox engag box gear transmiss doubl gear ratio transfer gearbox speed rear axl assembl gearbox engag ratio allow highest vehicl speed vehicl approach line aa quot steadi speed lowest speed engin speed equal quarter engin speed engin develop maximum power engin speed equal quarter maximum engin speed permit governor kilometr hour vehicl automat gearbox vehicl approach line aa quot steadi speed equal lowest speed kilometr hour quarter maximum speed choic quot normal quot selector posit town drive interpret result account inaccuraci measur instrument result obtain measur determin deduct db meter read measur consid valid differ consecut measur side vehicl exce db vehicl includ trailer semi trailer account determin line bb quot cross highest sound level measur constitut test result result exce db maximum permiss sound level categori vehicl test measur made measur obtain fall prescrib limit gt pic file quot quot gt measur nois stationari vehicl posit sound level meter measur made point shown figur distanc metr nearest surfac vehicl microphon situat metr ground level number measur measur made vehicl test condit engin vehicl speed governor run quarter rpm speed vehicl manufactur develop maximum power rpm speed engin measur mean independ instrument roller bed tachomet engin fit governor prevent engin exceed speed develop maximum power run maximum speed permit governor take measur engin brought normal run temperatur interpret result sound level read record report method calcul engin power shown state load vehicl measur consid valid differ consecut measur side vehicl exce db maximum figur record constitut result measur gt pic file quot quot gt ii exhaust system silenc ii vehicl fit devic design reduc exhaust nois silenc requir item ii appli inlet engin fit air filter order ensur complianc permiss sound level filter consid part silenc requir item ii appli filter ii draw exhaust system annex vehicl type approv certif ii silenc mark refer make type legibl indel ii fibrou absorb materi permit construct silenc condit fulfil ii fibrou absorb materi part silenc gase pass ii suitabl devic ensur fibrou absorb materi place time silenc ii fibrou absorb materi resist temperatur higher oper temperatur occur region silenc fibrou absorb materi situat