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	<title>Sightline InstituteTraffic Forecasting: A Blast from the Past - Sightline Institute</title>
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		<title>Traffic Forecasting: A Blast from the Past</title>
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		<pubDate>Mon, 25 Jun 2012 17:46:29 +0000</pubDate>
		<description><![CDATA[How traffic forecasts end up at odds with reality. | Looking through an old WSDOT traffic forecasting manual, Sightline intern Alex Broner came across this gem, illustrating the standard practices of the traffic engineering profession 20 years ago: To calculate [traffic] growth, a simple linear regression technique is used to fit a straight line through historical traffic volumes on roads containing projects that do not add lanes. A straight line has proven to be the best fit for predicting future...]]></description>
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