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I <br /> I <br /> I <br /> I <br />,I <br /> <br /> I <br /> I <br />! <br /> I <br />I <br /> I <br /> I <br /> I <br /> I <br /> I <br /> I <br /> <br /> Case Studies <br /> A. In San Francisco, California, six locations <br /> on three differeCt 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 ahd 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 bo.th sides of the street. <br />Before and after studies indicated aqo 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 rrdxed, but the majority have <br />been positive. <br /> <br />William Marconi, NSpeed Control Mea~ure~ in Re~identlal Area,, <br />"Traffic En~n~n~ ~E~ Ma~ 1~. <br />Ha~ S. Lure, '~e ~ of Rind Matings to Na~w ~n~ for <br />Con~IHng S~d in R~identlal A~*, "~ Journal, ~ June <br />l~. <br />D. T. Smi~, Jrv and D. AppleyarS, "Impmvlng ~e R~iden~al <br />S~t ~vi~nm~k" Re~ No. ~W~D~, F~eml ~gh- <br />way Ad~nls~on, Washln~on, D.~, May <br /> <br />Before and After Speed Studies at Locations Where Streets Were Narrowed <br /> in San Francisco, Califorrda <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, 22nd to 23rd St <br />Bryant at 23rd Street <br />Harrison at 23rd Street <br />Harrison St, 23rd to 24th St <br />Sanchez, 14th to Duboce St. <br /> <br />34 33 -1 <br />28 25 -3 <br />26 g7 +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 />