<html><head></head><body><div style="color:#000; background-color:#fff; font-family:Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_ym19_1_1530431294558_3190"><span></span></div> <div class="qtdSeparateBR" id="yui_3_16_0_ym19_1_1530431294558_3244"><span style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif;">On Sat, Jun 30, 2018 at 2:42 PM, derf </span><span dir="ltr" style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif;"><<a rel="nofollow" shape="rect" ymailto="mailto:derf247@gmail.com" target="_blank" href="mailto:derf247@gmail.com">derf247@gmail.com</a>></span><span style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif;"> wrote:</span><br></div><div class="yahoo_quoted" id="yui_3_16_0_ym19_1_1530431294558_3241" style="display: block;"><div id="yui_3_16_0_ym19_1_1530431294558_3240"><div id="yui_3_16_0_ym19_1_1530431294558_3239"><div class="y_msg_container" id="yui_3_16_0_ym19_1_1530431294558_3238" dir="ltr"><div id="yiv9914658615" style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 16px;"><div id="yui_3_16_0_ym19_1_1530431294558_3237"><div class="yiv9914658615yqt3531905692" id="yiv9914658615yqt81075"><div class="yiv9914658615gmail_extra" id="yui_3_16_0_ym19_1_1530431294558_3272"><div class="yiv9914658615gmail_quote" id="yui_3_16_0_ym19_1_1530431294558_3271"><blockquote class="yiv9914658615gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;" id="yui_3_16_0_ym19_1_1530431294558_3270"><div>104dB is 4x as loud as 98dB.</div><br clear="none"><div class="yiv9914658615gmail_quote" id="yui_3_16_0_ym19_1_1530431294558_3269"><div id="yui_3_16_0_ym19_1_1530431294558_3424"><div class="yiv9914658615h5" id="yui_3_16_0_ym19_1_1530431294558_3423"><div dir="ltr" id="yui_3_16_0_ym19_1_1530431294558_3422">On Sat, Jun 30, 2018, 12:37 AM Billy Zoom via Spridgets <<a rel="nofollow" shape="rect" ymailto="mailto:spridgets@autox.team.net" target="_blank" href="mailto:spridgets@autox.team.net">spridgets@autox.team.net</a>> wrote:<br clear="none"></div></div></div><blockquote class="yiv9914658615gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;" id="yui_3_16_0_ym19_1_1530431294558_3268"><div id="yui_3_16_0_ym19_1_1530431294558_3426"><div class="yiv9914658615h5" id="yui_3_16_0_ym19_1_1530431294558_3425">> UK Noise limits vary but 98 to 103, and occasionally 105 are typical.<br clear="none">
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Assuming these are db ratings, at what distance from the car is it measured?<br clear="none">
The sound pressure drops by half each time the distance is doubled.<br clear="none">
104db would be twice as loud as 98db, so it seems there’s quite a range.<br clear="none">
I’ve had much experience with ill-trained security guards misusing sound pressure meters, so I’m naturally skeptical of such regulations.<br clear="none">
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</blockquote></div><br clear="none"></div></div></div></div><div class="yqt3531905692" id="yqt05114" style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 16px;">------------------------<br clear="none">For UK Motor Sport (governed by the RACMSA) the sound levels are outlined in the PDF, </div><div class="yqt3531905692" id="yqt05114" style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 16px;"><br></div><div class="yqt3531905692" id="yqt05114" style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 16px;"> <span style="color: rgb(0, 102, 33); font-size: 14px; font-family: arial, sans-serif; line-height: 16px; white-space: nowrap;" id="yui_3_16_0_ym19_1_1530431294558_3600"><a href="https://www.msauk.org/.../144-155commonregulationsforcompetitorsvehiclesj-2.pdf" id="yui_3_16_0_ym19_1_1530431294558_3651">https://www.msauk.org/.../144-155commonregulationsforcompetitorsvehiclesj-2.pdf</a></span></div><div class="yqt3531905692" id="yqt05114" style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 16px;"><br></div><div class="yqt3531905692" id="yqt05114" style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 16px;"><span style="color: rgb(0, 102, 33); font-size: 14px; font-family: arial, sans-serif; line-height: 16px; white-space: nowrap;"></span>The paragraphs at 5.17 and 5.18 refer in combination with the drawing at 5.18 ( page 11 of the PDF and page 154 of the 'Blue Book') with the drawing being the most readily understandable depiction. </div><div class="yqt3531905692" id="yqt05114" style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 16px;">I fully endorse Billy Zoom's comments about sound level measuring being open to variations in the manner levels are taken and even a child shouting/crying 100 metres away or being level with a noise reflecting building can cause meter level reading anomaly. </div><font face="HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif" id="yui_3_16_0_ym19_1_1530431294558_4686">In civil practise, that is normal use on public roads, it is illegal to modify the exhaust system to make a vehicle noisier after it has been ‘type approved’ (checked by manufacturer so it meets environmental and safety standards).</font></div><div dir="ltr" id="yui_3_16_0_ym19_1_1530431294558_4690"><font face="HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif" id="yui_3_16_0_ym19_1_1530431294558_4691">The police can also take action if your vehicle’s silencer does not work in the way it was designed or if you’re driving in a way that creates too much noise.</font></div><div dir="ltr" id="yui_3_16_0_ym19_1_1530431294558_4690"><font face="HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif"><br></font></div><div dir="ltr" id="yui_3_16_0_ym19_1_1530431294558_4690"><font face="HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif" id="yui_3_16_0_ym19_1_1530431294558_5107">Hope it helps,</font></div><div dir="ltr" id="yui_3_16_0_ym19_1_1530431294558_4690"><font face="HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif"><br></font></div><div dir="ltr" id="yui_3_16_0_ym19_1_1530431294558_4690"><font face="HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif">Guy R Day</font></div><div dir="ltr" id="yui_3_16_0_ym19_1_1530431294558_4690"><font face="HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif"><br></font></div> </div> </div> </div></div></body></html>