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2011-06-28_PWETC_AgendaPacket
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2011-06-28_PWETC_AgendaPacket
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6/28/2011 9:08:16 AM
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Commission/Authority Name
Public Works Commission
Commission/Committee - Document Type
Agenda/Packet
Commission/Committee - Meeting Date
6/28/2011
Commission/Committee - Meeting Type
Regular
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City of Des Plaines Neighborhood Traffic Management Policy <br />Page 2 of 4 <br />stop signs and the level of speed limits are subject to the federal Manual of Uniform Traffic <br />Control Devices (MUTCD). <br />For example, the role of stop signs is to control right -of -way. They are explicitly not to be <br />used in controlling speeding. The reason for this is that decades of national and local <br />research have revealed that using stop signs where they are not warranted for controlling <br />right of-way actually makes conditions less safe for pedestrians due to more drivers <br />ignoring these unwarranted signs and also by reducing the credibility of warranted stop <br />signs. Similarly, artificially reduced speed limits have been unquestionably shown to not <br />reduce speeds. They serve only to make violators out of even responsible drivers. <br />While it is quite easy and inexpensive to litter the City with stop signs and artificially <br />lowered speed limits, doing so would not only not solve the issues, it would knowingly <br />create more hazardous conditions and be a direct violation of federal guidelines. The City <br />will investigate each location against the applicable stop sign and speed limit warrants. <br />However, there are not likely to be many locations remaining in the City where stop signs or <br />lowered speed limits would be warranted. <br />Pavement Markings <br />Pavement markings may be used to guide traffic flow or to visually narrow the roadway. A <br />common application is to add a parking lane edgeline on a street, along with diagonal <br />striping in the "no parking" zones adjacent to intersections and fire hydrants. However, this <br />approach is only possible on two -way streets that are at least 28 feet wide or one -way <br />streets that are at least 20 feet wide. <br />Research indicates that pavement marking tends to slow the fastest drivers on a street due <br />to the psychological narrowing effect. However pavement markings alone do not typically <br />reduce the 85th percentile speed by a substantial margin. And while relatively inexpensive <br />compared to physical changes to the street, the cost of pavement marking can still be <br />significant if a long stretch of street is to be treated. <br />Parking Modifications <br />The addition of parking to a street or to both sides of a street can slow traffic due to the <br />narrowing effect it has upon a street. However, various standards apply depending upon <br />the width of and volume of traffic on the street, to ensure safe access for both resident <br />vehicles and emergency response vehicles. <br />One approach for streets with parking on one side is to alternate the side of the street <br />where the cars are parked in order to create a "chicane" or serpentine effect. Basically this <br />approach serves to help break up a long straight stretch of roadway. <br />One -way Streets <br />A strategy used in gridded areas (e.g. Chicago) is to convert alternating streets to one -way <br />traffic. This is typically used to address severe cut through traffic issues rather than speed <br />issues since the conversion of the street to one -way flow without an accompanying <br />narrowing or addition of parking could actually result in increased speeds. <br />
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