Laserfiche WebLink
I <br />! <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />! <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 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 /> ~ 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 throughlthe use of pavement mark- <br />ings. On France Avenue, 74th Avenue, and <br />Xerxes Avenue, th~ 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 />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 parking lane lines have <br />been somewhat mixed, but the majority have <br />been positive. <br /> <br />William Marconi, "Speed Control Memaur'~ in Re~identlal Are-as, <br />"Traffic Eng~nee_r4nb ITE, March 1977. <br /> <br />Harry S. Lure, "The Use of Road Markings to Narrow Lanes for <br />Controlling Speed in Residential Ar~as~ "ITE Journal, ITE, June <br />1984. <br /> <br />D. T. Smith, Jr., and D. Appleyard, "Improving the Residential <br />Street E.~vlronment~' Report No. FHWA/P,D-81/03-i, Federal High- <br />w~y Adrrdnlstratlon, Washington, D.C-, May 1981. <br /> <br />Before and After Speed Studies at Locations Where Streets Were Narrowed <br /> in San Francisco, Ca_lifomia <br /> <br />Location <br /> <br />95th Percentile Speed <br /> Net <br />Before After Change <br />(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 27 +1 <br />35 30 -5 <br />32 30 .-2 <br />27 28 +1 <br /> <br />Neighborhood Traffic Con trol <br /> <br />January 1994 <br /> <br /> <br />