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    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>EFFECTS OF RAMP METERING WITH HOV BYPASS LANES ON VEHICLE OCCUPANCY</title>
      <link>https://trid.trb.org/View/276748</link>
      <description><![CDATA[The concept of providing preferential treatment for high occupancy vehicles on metered freeway on-ramps is being tested for the first time in northern California, as a cost-effective means of reducing freeway congestion. The purpose of this research project was to evaluate the impacts of ramp meter bypass lanes on the traffic system, and on vehicle occupancy in particular. A comparison of before and after project mean occupancy rates and an analysis of covariance revealed a 0.015 person per vehicle increase in automobile occupancy for the ramps with bypass lanes, and a 0.014 person per vehicle decrease for the ramps without bypass lanes. However, it is suspected that these results are mostly explained by a shift of existing carpools from the nonbypass ramps to the ramps with carpool bypass lanes. Another important discovery revealed that bypass lanes and ramp metering can actually be counterproductive to one another. Ramp metering smooths out the congestion, which decreases the carpool incentive, and unless the geometrics of the project are carefully planned, the vehicles that use the bypass lanes can interfere with the ability of the ramp meters to reduce mainline congestion. Although new carpool information was negligible, the tendency for automobile occupancy to increase where the carpool bypass lane incentive is implemented cannot be ignored. The possibility for greater reductions in vehicle miles traveled as a result of the bypass lanes in the future is quite strong if increased traffic congestion enhances the time savings incentive.]]></description>
      <pubDate>Sun, 30 Nov 1986 00:00:00 GMT</pubDate>
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