Agenda Packets - 1990/12/03 - Laserfiche WebLink

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;t: IDGEOMETRIC FEATURES FOR NEIGHBORHOOD TRAFFIC CONTROL 91 — Features which physically reduce speed, such as pavement undulations and • raised intersections. — Features which attract the special attention of drivers,such as nimble strips. Their common characteristic is that by their physical form they force or prohibit a specific action.Geometric features have the advantages of being largely self-enforcing and of creating a visual impression,real or imagined,that a street is not intended for through traffic.The disadvantages relative to other devices are their cost,the potential negative im- pact on emergency and service vehicles,and the imposition of inconvenient access on some parts of a neighborhood.They also are static and must be appropriate at all hours of the day and night. ' Chokers,traffic circles,median barriers,diverters,channelization,and cul-de-sacs, as well as some less commonly used geometric features,are described in detail in this sec- tion.All such features are normally deployed in conjunction with traffic control devices such as signs,pavement markings,and reflectors,to warn motorists of their presence and indicate appropriate behavior. Chokers A choker or curb bulb is a narrowing of a street, either at an intersection (Fig. 5.3) or midblock,in order to reduce the width of the traveled way.While the term usually is ap- plied to a design which widens a sidewalk at the point of crossing,it also includes the use • of islands which force traffic toward the curb while reducing the roadway width. l� f %-:------=--411 sa. itii - ....___.,„ All) ^ moi/ :INCH to Q g' g: C 1 l 1➢DD r STREET b c• li + MAIIIIIIIIMMIEPNI ...-1 ---. .-'---- ------____-#.7"-------..--- -N‹.....„ i / --'-'•-------• ___„_.- . .----;"-- ----____. i 0 AO ....4. .. a m Figure 5.3 Choker. t