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		<id>https://www.explainxkcd.com/wiki/index.php?action=history&amp;feed=atom&amp;title=165%3A_Turn_Signals</id>
		<title>165: Turn Signals - Revision history</title>
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		<updated>2026-04-14T17:43:26Z</updated>
		<subtitle>Revision history for this page on the wiki</subtitle>
		<generator>MediaWiki 1.30.0</generator>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=165:_Turn_Signals&amp;diff=248824&amp;oldid=prev</id>
		<title>162.158.62.180: Undo revision 248744 by Ex Kay Cee Dee (talk)</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=165:_Turn_Signals&amp;diff=248824&amp;oldid=prev"/>
				<updated>2022-05-04T21:21:32Z</updated>
		
		<summary type="html">&lt;p&gt;Undo revision 248744 by &lt;a href=&quot;/wiki/index.php/Special:Contributions/Ex_Kay_Cee_Dee&quot; title=&quot;Special:Contributions/Ex Kay Cee Dee&quot;&gt;Ex Kay Cee Dee&lt;/a&gt; (&lt;a href=&quot;/wiki/index.php/User_talk:Ex_Kay_Cee_Dee&quot; title=&quot;User talk:Ex Kay Cee Dee&quot;&gt;talk&lt;/a&gt;)&lt;/p&gt;
&lt;a href=&quot;//www.explainxkcd.com/wiki/index.php?title=165:_Turn_Signals&amp;amp;diff=248824&amp;amp;oldid=248744&quot;&gt;Show changes&lt;/a&gt;</summary>
		<author><name>162.158.62.180</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=165:_Turn_Signals&amp;diff=248744&amp;oldid=prev</id>
		<title>Ex Kay Cee Dee at 21:20, 4 May 2022</title>
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				<updated>2022-05-04T21:20:30Z</updated>
		
		<summary type="html">&lt;p&gt;&lt;/p&gt;
&lt;a href=&quot;//www.explainxkcd.com/wiki/index.php?title=165:_Turn_Signals&amp;amp;diff=248744&amp;amp;oldid=248681&quot;&gt;Show changes&lt;/a&gt;</summary>
		<author><name>Ex Kay Cee Dee</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=165:_Turn_Signals&amp;diff=248681&amp;oldid=prev</id>
		<title>While False: rv</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=165:_Turn_Signals&amp;diff=248681&amp;oldid=prev"/>
				<updated>2022-05-04T21:19:52Z</updated>
		
		<summary type="html">&lt;p&gt;rv&lt;/p&gt;
&lt;a href=&quot;//www.explainxkcd.com/wiki/index.php?title=165:_Turn_Signals&amp;amp;diff=248681&amp;amp;oldid=248675&quot;&gt;Show changes&lt;/a&gt;</summary>
		<author><name>While False</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=165:_Turn_Signals&amp;diff=248675&amp;oldid=prev</id>
		<title>Ex Kay Cee Dee at 21:19, 4 May 2022</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=165:_Turn_Signals&amp;diff=248675&amp;oldid=prev"/>
				<updated>2022-05-04T21:19:47Z</updated>
		
		<summary type="html">&lt;p&gt;&lt;/p&gt;
&lt;a href=&quot;//www.explainxkcd.com/wiki/index.php?title=165:_Turn_Signals&amp;amp;diff=248675&amp;amp;oldid=245067&quot;&gt;Show changes&lt;/a&gt;</summary>
		<author><name>Ex Kay Cee Dee</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=165:_Turn_Signals&amp;diff=245067&amp;oldid=prev</id>
		<title>Jacky720: rv</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=165:_Turn_Signals&amp;diff=245067&amp;oldid=prev"/>
				<updated>2022-05-04T20:57:11Z</updated>
		
		<summary type="html">&lt;p&gt;rv&lt;/p&gt;
&lt;a href=&quot;//www.explainxkcd.com/wiki/index.php?title=165:_Turn_Signals&amp;amp;diff=245067&amp;amp;oldid=244126&quot;&gt;Show changes&lt;/a&gt;</summary>
		<author><name>Jacky720</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=165:_Turn_Signals&amp;diff=244126&amp;oldid=prev</id>
		<title>Ex Kay Cee Dee at 20:43, 4 May 2022</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=165:_Turn_Signals&amp;diff=244126&amp;oldid=prev"/>
				<updated>2022-05-04T20:43:50Z</updated>
		
		<summary type="html">&lt;p&gt;&lt;/p&gt;
&lt;a href=&quot;//www.explainxkcd.com/wiki/index.php?title=165:_Turn_Signals&amp;amp;diff=244126&amp;amp;oldid=238575&quot;&gt;Show changes&lt;/a&gt;</summary>
		<author><name>Ex Kay Cee Dee</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=165:_Turn_Signals&amp;diff=238575&amp;oldid=prev</id>
		<title>Davidy22: Reverted edits by X. K. C. D. (talk) to last revision by Lettherebedarklight</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=165:_Turn_Signals&amp;diff=238575&amp;oldid=prev"/>
				<updated>2022-05-04T02:00:25Z</updated>
		
		<summary type="html">&lt;p&gt;Reverted edits by &lt;a href=&quot;/wiki/index.php/Special:Contributions/X._K._C._D.&quot; title=&quot;Special:Contributions/X. K. C. D.&quot;&gt;X. K. C. D.&lt;/a&gt; (&lt;a href=&quot;/wiki/index.php?title=User_talk:X._K._C._D.&amp;amp;action=edit&amp;amp;redlink=1&quot; class=&quot;new&quot; title=&quot;User talk:X. K. C. D. (page does not exist)&quot;&gt;talk&lt;/a&gt;) to last revision by &lt;a href=&quot;/wiki/index.php/User:Lettherebedarklight&quot; title=&quot;User:Lettherebedarklight&quot;&gt;Lettherebedarklight&lt;/a&gt;&lt;/p&gt;
&lt;a href=&quot;//www.explainxkcd.com/wiki/index.php?title=165:_Turn_Signals&amp;amp;diff=238575&amp;amp;oldid=235960&quot;&gt;Show changes&lt;/a&gt;</summary>
		<author><name>Davidy22</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=165:_Turn_Signals&amp;diff=235960&amp;oldid=prev</id>
		<title>X. K. C. D. at 00:41, 4 May 2022</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=165:_Turn_Signals&amp;diff=235960&amp;oldid=prev"/>
				<updated>2022-05-04T00:41:19Z</updated>
		
		<summary type="html">&lt;p&gt;&lt;/p&gt;
&lt;a href=&quot;//www.explainxkcd.com/wiki/index.php?title=165:_Turn_Signals&amp;amp;diff=235960&amp;amp;oldid=228169&quot;&gt;Show changes&lt;/a&gt;</summary>
		<author><name>X. K. C. D.</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=165:_Turn_Signals&amp;diff=228169&amp;oldid=prev</id>
		<title>Lettherebedarklight: /* Explanation */ pruning bits</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=165:_Turn_Signals&amp;diff=228169&amp;oldid=prev"/>
				<updated>2022-03-09T04:18:29Z</updated>
		
		<summary type="html">&lt;p&gt;‎&lt;span dir=&quot;auto&quot;&gt;&lt;span class=&quot;autocomment&quot;&gt;Explanation: &lt;/span&gt; pruning bits&lt;/span&gt;&lt;/p&gt;
&lt;table class=&quot;diff diff-contentalign-left&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;tr style=&quot;vertical-align: top;&quot; lang=&quot;en&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;Revision as of 04:18, 9 March 2022&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l8&quot; &gt;Line 8:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 8:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;==Explanation==&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;==Explanation==&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;{{w|&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;Automotive lighting#&lt;/del&gt;Turn signals&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;|Turn Signals&lt;/del&gt;}} are designed to flash between 60 and 120 times per minute. Most turn signals are driven by an {{w|electromechanical}} device. Due to manufacturing tolerances, battery state of charge, ambient temperature, and various other factors, two different turn signals rarely flash at the same rate, even among cars of the same make and model. Having two cars with turn signals flashing at the same rate would be a rare event.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;{{w|Turn signals}} are designed to flash between 60 and 120 times per minute. Most turn signals are driven by an {{w|electromechanical}} device. Due to manufacturing tolerances, battery state of charge, ambient temperature, and various other factors, two different turn signals rarely flash at the same rate, even among cars of the same make and model. Having two cars with turn signals flashing at the same rate would be a rare event.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[Cueball]] notices this event, and expresses his excitement to the driver of the other car, despite being stopped at an intersection. The other driver is confused by this. Turn signal frequency is something that most people don't take notice of.{{Citation needed}} Cueball, however, takes it as an opportunity to strike up a conversation and make a new friend.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[Cueball]] notices this event, and expresses his excitement to the driver of the other car, despite being stopped at an intersection. The other driver is confused by this. Turn signal frequency is something that most people don't take notice of.{{Citation needed}} Cueball, however, takes it as an opportunity to strike up a conversation and make a new friend.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>Lettherebedarklight</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=165:_Turn_Signals&amp;diff=204474&amp;oldid=prev</id>
		<title>Danish: citation needed</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=165:_Turn_Signals&amp;diff=204474&amp;oldid=prev"/>
				<updated>2021-01-12T17:10:05Z</updated>
		
		<summary type="html">&lt;p&gt;citation needed&lt;/p&gt;
&lt;table class=&quot;diff diff-contentalign-left&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;tr style=&quot;vertical-align: top;&quot; lang=&quot;en&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;Revision as of 17:10, 12 January 2021&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l10&quot; &gt;Line 10:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 10:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;{{w|Automotive lighting#Turn signals|Turn Signals}} are designed to flash between 60 and 120 times per minute. Most turn signals are driven by an {{w|electromechanical}} device. Due to manufacturing tolerances, battery state of charge, ambient temperature, and various other factors, two different turn signals rarely flash at the same rate, even among cars of the same make and model. Having two cars with turn signals flashing at the same rate would be a rare event.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;{{w|Automotive lighting#Turn signals|Turn Signals}} are designed to flash between 60 and 120 times per minute. Most turn signals are driven by an {{w|electromechanical}} device. Due to manufacturing tolerances, battery state of charge, ambient temperature, and various other factors, two different turn signals rarely flash at the same rate, even among cars of the same make and model. Having two cars with turn signals flashing at the same rate would be a rare event.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[Cueball]] notices this event, and expresses his excitement to the driver of the other car, despite being stopped at an intersection. The other driver is confused by this. Turn signal frequency is something that most people don't take notice of. Cueball, however, takes it as an opportunity to strike up a conversation and make a new friend.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[Cueball]] notices this event, and expresses his excitement to the driver of the other car, despite being stopped at an intersection. The other driver is confused by this. Turn signal frequency is something that most people don't take notice of.&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;{{Citation needed}} &lt;/ins&gt;Cueball, however, takes it as an opportunity to strike up a conversation and make a new friend.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The beat frequency is the rate at which two frequencies transition from being ''{{w|phase (waves)|in phase}}'' with each other to being ''out of phase'' and then to being ''in phase'' again. In other words, two turn signals that begin by flashing together will transition to flashing opposite each other and then back to flashing together, and the rate at which this process cycles is the beat frequency. Because the beat frequency is simply the ''difference'' between the two turn signal frequencies, two turn signals whose frequencies are closer together will take longer to pass through the in-phase/out-of-phase cycle, and two signals whose frequencies are identical would take an infinite time (i.e., their relative phase never changes). The beating of turn signals is an easy phenomenon to observe when one is stopped at a {{w|traffic light}} with nothing to do but watch the flashing turn signals, and it is the lack of beating that Cueball noticed and excitedly reported.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The beat frequency is the rate at which two frequencies transition from being ''{{w|phase (waves)|in phase}}'' with each other to being ''out of phase'' and then to being ''in phase'' again. In other words, two turn signals that begin by flashing together will transition to flashing opposite each other and then back to flashing together, and the rate at which this process cycles is the beat frequency. Because the beat frequency is simply the ''difference'' between the two turn signal frequencies, two turn signals whose frequencies are closer together will take longer to pass through the in-phase/out-of-phase cycle, and two signals whose frequencies are identical would take an infinite time (i.e., their relative phase never changes). The beating of turn signals is an easy phenomenon to observe when one is stopped at a {{w|traffic light}} with nothing to do but watch the flashing turn signals, and it is the lack of beating that Cueball noticed and excitedly reported.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>Danish</name></author>	</entry>

	</feed>