Laserfiche WebLink
Case Studies <br /> <br />A. In San Francisco, California, six locations <br />on three different streets were physically nar- <br />rowed in connection with a street beautifica- <br />tion program. Street width reduction ranged <br />from 8 to 18 feet,, but still left two lanes of <br />substantial width (the narrowest, 11 feet <br />wide). Before and after studies showed that <br />there was no consiStent or material reduction <br />in the speed of traffic after street narrowing. <br />The table below shows the results of the before <br />and after speed studies: <br /> <br />B. In Brooklyn Park, Minnesota, four collec- <br />tor streets in residential neighborhoods were <br />narrowed through the use of pavement mark- <br />ings. On France Avenue, 74th Avenue, and <br />Xerxes Avenue, the 44-foot width of the road- <br />way was narrowed by marking a five-foot <br />wide bike lane on both sides of the road. On <br />Brookdale Drive, the 44-foot width of the <br />roadway was narrowed by marking 8-foot <br /> <br />wide parking lanes on both sides of the street. <br />Before and after studies indicated .no change <br />in the speed of traffic, volume of traffic or <br />accident rate on any of these streets due to the <br />street narrowing. On-street parking was <br />prohibited along with providing bike lanes, <br />and these parking regulations have resulted <br />in several complaints from the neighborhood. <br />Comments on the parking lane lines have <br />been somewhat mixed, but the majority have <br />been positive. <br /> <br />Reference~ <br /> <br />William Mamoni, "Speed Control Measure* in Ret*idential Areas, <br />'?Fr~ffic Engineering~ ITE~ March 1977. <br />Harry $. Lure, "The Use of Road Markings to Narrow Lanes for <br />Controlling Speed in Re~identlal Are. aa, "ITE Journal, ITE, June <br />1984. <br /> <br />D. T. Smith, Jr., and D. Appleyard, "Improving the Residential <br />Street Env|ronmentt" Report No. lrHWA./RD-81d031~ Federal High- <br />way Adn'dnistratlon, Washlngtont D.C., May 1981. <br /> <br />Before and After Speed Studies at Locations Where Streets Were Narrowed <br /> in San Francisco, California <br /> <br />Location <br /> <br />95th Percentile Speed <br /> Net <br />Before After Change <br />(mph) (mph) (mph)- <br /> <br />Bryant at 21st Street <br /> <br />Bryant Street, 22,nd to 23rd St <br /> <br />Bryant at 23rd Street <br /> <br />Harrison at 23rd Street <br /> <br />Harrison St, 23rd to 24th St <br /> <br />Sanchez, 14th to Duboce St. <br /> <br />34 33 -1 <br />28 25 -3 <br />26 27 +1 <br />35 30 -5 <br />32 30 . -2 <br />27 28 +1 <br /> <br />Neighborhood Traffic Control <br /> <br />January 1994 <br /> <br /> <br />