<story><title>New York is using cameras with microphones to ticket loud cars</title><url>https://www.roadandtrack.com/news/a39105913/new-york-automated-sound-tickets/</url></story><parent_chain><item><author>e40</author><text>There&amp;#x27;s a freeway about a mile from my house.  Summer nights with the windows open, I can easily be awakened by a very loud motorcycle.  The freeway is raised and I&amp;#x27;m in a sort of canyon (no line of sight to freeway, though!!).  Maybe the acoustics are just perfect for my bedroom, but I doubt it&amp;#x27;s just me.  There are probably a million people within earshot of this noise.&lt;p&gt;Lest people think I&amp;#x27;m a motorcycle hater: I owned one for years.  I had a stock and quiet muffler on it, though.</text></item><item><author>udfalkso</author><text>One egregiously loud motorcycle rolling through manhattan can be a nuisance to literally millions of people. This is unreasonable and a ticketing system like this makes a ton of sense.&lt;p&gt;Police enforcement could probably solve the issue just as effectively.  Cops ignore loud honking and loud cars when its right in front of them.  If they would just stop ignoring such things the frequency would surely go down as well.</text></item></parent_chain><comment><author>plushpuffin</author><text>That&amp;#x27;s happening to you because sound is refracted by the atmosphere at night and bounced back toward the ground.&lt;p&gt;&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;www.nbcnews.com&amp;#x2F;id&amp;#x2F;wbna43154773&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;www.nbcnews.com&amp;#x2F;id&amp;#x2F;wbna43154773&lt;/a&gt;&lt;p&gt;&amp;gt; &amp;quot;What we managed to show is the combination of the crosswind and the temperature gradient can cause sound that&amp;#x27;s going to go vertically (to) get refracted back down,&amp;quot; he said. &amp;quot;The sound was literally bent back downwards.&amp;quot;&lt;p&gt;&amp;gt; The effect often happens at dawn and dusk because sound bends from hotter air into cooler air. During the day, the ground is hotter than the air above it so sound bends vertically upward.&lt;p&gt;&amp;gt; &amp;quot;Its only when the sun stops falling on the ground that the ground cools down. Then the air gets hotter above,&amp;quot; he said. &amp;quot;That&amp;#x27;s when sound can bend towards the ground and become trapped.&amp;quot;</text></comment>
<story><title>New York is using cameras with microphones to ticket loud cars</title><url>https://www.roadandtrack.com/news/a39105913/new-york-automated-sound-tickets/</url></story><parent_chain><item><author>e40</author><text>There&amp;#x27;s a freeway about a mile from my house.  Summer nights with the windows open, I can easily be awakened by a very loud motorcycle.  The freeway is raised and I&amp;#x27;m in a sort of canyon (no line of sight to freeway, though!!).  Maybe the acoustics are just perfect for my bedroom, but I doubt it&amp;#x27;s just me.  There are probably a million people within earshot of this noise.&lt;p&gt;Lest people think I&amp;#x27;m a motorcycle hater: I owned one for years.  I had a stock and quiet muffler on it, though.</text></item><item><author>udfalkso</author><text>One egregiously loud motorcycle rolling through manhattan can be a nuisance to literally millions of people. This is unreasonable and a ticketing system like this makes a ton of sense.&lt;p&gt;Police enforcement could probably solve the issue just as effectively.  Cops ignore loud honking and loud cars when its right in front of them.  If they would just stop ignoring such things the frequency would surely go down as well.</text></item></parent_chain><comment><author>whartung</author><text>On a motorcycle forum, someone asked whether they should upgrade their suspension or their exhaust. I suggested that an upgraded suspension affects your quality of life, an upgraded exhaust affects everyone else.&lt;p&gt;We don&amp;#x27;t need the windows open to hear the cars and such around here (and they&amp;#x27;re modern windows). We&amp;#x27;re near a freeway, but it&amp;#x27;s not the only culprit. The freeway is either silent or quite noisy depending on ambient weather conditions.&lt;p&gt;But when the cars open up, it sounds like a racetrack. We can hear them accelerating up the on ramp, up shifting as they go, and even when they hit the flyover to the other freeway.&lt;p&gt;The ratio of motorcycles to cars is actually quite low. Most of the offenders are the V8 pony cars.</text></comment>