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    <copyright>Copyright © 2026. National Academy of Sciences. All rights reserved.</copyright>
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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>EFFECT OF CURB PARKING ON INTERSECTION CAPACITY</title>
      <link>https://trid.trb.org/View/116655</link>
      <description><![CDATA[TO INCREASE THE TRAFFIC CAPACITY THROUGH SIGNALIZED INTERSECTIONS, MANY TRAFFIC ENGINEERS HAVE RESORTED TO COMPLETE PROHIBITION OF PARKING ON HEAVILY TRAVLED ARTERIES. AS A CONSEQUENCE, APPROPRIATE REGULATIONS HAVE BEEN ADOPTED UNDER WHICH PARKING CAN BE RESTRICTED FOR VARIOUS REASONS. THIS PAPER ATTEMPTS TO SHOW, THROUGH QUANTITATIVE EVALUATION, THE EFFECTS ON INTERSECTION CAPACITY, OF VARYING LENGTHS OF CLEAR DISTANCE ADJACENT TO AN INTERSECTION. BY CONTROLLING CONDITIONS AT THE STUDY INTERSECTION, FACTORS INFLUENCING CAPACITY, SUCH AS PEDESTRIAN AND PARKING MANEUVERS, ARE KEPT TO A MINIMUM IN ORDER TO MORE ACCURATELY ESTABLISH THE RELATIONSHIP BETWEEN CLEAR DISTANCE AND INTERSECTION CAPACITY. THE INTERSECTION SELECTED FOR STUDY CONSISTS OF A THREE-LANE ONE-WAY STREET INTERSECTING A TWO-LANE TWO-WAY STREET. BLOCKING OFF NEARLY A FULL LANE FIRST ON ONE SIDE OF THE ONE-WAY APPROACH AND THEN ON THE OTHER SIDE, AND THEN ALLOWING VEHICLES TO UTILIZE VARYING LENGTHS OF CLEAR DISTANCE IN THE CURB LANES, IT WAS POSIBLE TO OBTAIN SUFFICIENT DATA TO SUGGEST A RELATIONSHIP BETWEEN CLEAR DISTANCE IN THE CURB LANE AND INTERSECTION CAPACITY. THE RELATIONSHIP IS TESTED STATISTICALLY BY THE STUDENTS 'T' METHOD AND CORRELATION BY RANKS. THE RESULTS AS THEY PERTAIN TO THE SPECIFIC INTERSECTION INVOLVED ARE THAT MAXIMUM VOLUMES OF TRAFFIC CAN BE MOVED THROUGH AN INTERSECTION WITHOUT COMPLETE PROHIBITION OF PARKING, AND THAT ON THE APPROACH THE CLEAR DISTANCE ADJACENT TO THE INTERSECTION REQUIRED FOR MAXIMUM VOLUMES IS RELATED TO THE PERCENTAGE OF TURNING MOVEMENTS. /AUTHOR/]]></description>
      <pubDate>Fri, 16 Sep 1994 00:00:00 GMT</pubDate>
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      <title>TRAFFIC ACCIDENTS AND THE QUALITY OF TRAFFIC FLOW</title>
      <link>https://trid.trb.org/View/111162</link>
      <description><![CDATA[THIS IS A REPORT OF AN ATTEMPT TO FIND IF THERE IS A CORRELATION BETWEEN THE QUALITY OF TRAFFIC FLOW AND THE FREQUENCY OF HIGHWAY ACCIDENTS. THE TERM QUALITY CHARACTERIZES THE TRAFFIC STEAM AND INDICATES THE MANNER IN WHICH VEHICLES MOVE. IN MAKING THE STUDY THREE SECTIONS OF HIGHWAY WITH DIFFERENT ACCIDENT FREQUENCIES PER MILLION VEHICLE-MILES WERE SELECTED FOR INVESTIGATION. TWO OF THE SECTIONS ARE TWO-LANE AND THE THIRD IS THREE-LANE. THE ACCIDENT FREQUENCIES AND THE CORRESPONDING QUALITY INDICES ARE MENTIONED ACCORDING TO ROAD, QUALITY INDEX, AND ACCIDENTS PER MILLION VEHICLE MILES. THE THREE-LANE ROAD WITH THE HIGHEST QUALITY INDEX DID NOT HAVE THE LOWEST ACCIDENT RATE. THIS INDICATES THAT THERE IS NO DIRECT CORRELATION BETWEEN THE INDEX AND ACCIDENT FREQUENCY. ON THE OTHER HAND, IT COULD REVEAL THAT A THREE-LANE ROAD SHOULD NOT BE COMPARED WITH A TWO-LANE. FURTHERMORE, IT COULD BE THAT SINGLE VEHICLE ACCIDENTS ARE A BETTER BASIS FOR A COMPARISON OF THE TYPES OF ROADS. THE FACT THAT THERE WERE MORE ACCIDENTS ON THE CURVING ROAD THAN ON THE STRAIGHTER ONE, POINTS TO THE NEED FOR INCLUDING CHANGE OF VEHICLE DIRECTION AS WELL AS CHANGE OF SPEED IN THE QUALITY INDEX. THE RESULTS OF THIS LIMITED STUDY SHOW THAT IMPROVING THE QUALITY OF TRAFFIC FLOW SHOULD REDUCE ACCIDENTS. APPARENTLY THE INHERENT CHARACTERISTICS OF FLOW IN A TRAFFIC STEAM TEND TO MAKE IT SAFE OR HAZARDOUS.]]></description>
      <pubDate>Sun, 01 May 1994 00:00:00 GMT</pubDate>
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