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~ Case Studies <br /> A. In San Francisco, California, six locations <br /> on three d/ffereht sweets were physically nar- <br /> rowed in conne'~:tion with a street beautifica- <br /> tion program. Street width reduction ranged <br /> from 8 to 18 feet, but st/Il left two lanes of <br /> substantial w/d~th (the narrowest, 11 feet <br /> wide). Before a~d after studies showed that <br /> there was no coi'~sistent 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 ~tudies: <br />B. In Brooklyn park, Mirmesota, four collec- <br />tor streets in res~ential neighborhoods were <br />narrowed throug~, the use of pavement mark- <br />ings. On Francel Avenue, 74th Avenue, and <br />Xerxes Avenue, t-be 44 foot width of the road- <br />way was narrov~ed by marking a five-foot <br />wide bike lane orr both sides of the road. On <br />Brookdale Drive~ the 44 foot width of the <br />roadway was n~rowed by marking 8-foot <br /> <br />wide parking lanes on bo.th sides of the street. <br />Before and after studies indicated 3o change <br />in the speed of traffic, volume of traffic or <br />acddent 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 parldng lane lines have <br />been somewhat mixe4 but the majority have <br />been positive. <br /> <br />William Marconi, 'Speed Control Me.a.ure~ in Resldenfial Areas, <br />"Traffic En~neerlng, ITE, Mamh 1FTT. <br />Harry S. Lure, "The Ur.e of Road Markings to Narrow Imnes for <br />Controlling Speed in Re*idential Ama,, "ITE Journal, ITEt June <br /> <br />D. T. Smltl~ Jr., and D. Appleyar~ "ImFrovlng the Re*identlal <br />Street Envlronm~nt~~ Report No. FHWA/RD-SR/031, Federal High- <br />way Admlnlstrafion, Washington, D.Cv M~y 1981. <br /> <br />Before ~nd 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 S~eet <br /> <br />Bryant Street, 22nd to 23rd St <br /> <br />Bryant at 23rd Street <br /> [ · <br /> <br />I--Iarfison 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 27 +1 <br />35 30 -5 <br />32 30 -2 <br />27 28 +1 <br /> <br />Neighborhood Traffic ~ontrol <br /> <br />January 1994 <br /> <br />7-2 <br /> <br /> <br />