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Traffic calming measures can also be employed in the construction of new streets to prevent <br /> problems from developing in newly constructed or future residential areas. To date, traffic <br /> calming measures have been applied only on existing public streets in established <br /> neighborhoods. The use of these devices are intended for use only on non - arterial streets. <br /> Application of these techniques must be evaluated on a case -by -case basis using engineering' <br /> judgement. Planning and design should be coordinated with emergency and other service <br /> providers who will be affected by their use. <br /> Recommendations: <br /> 1. Amend Design Standards for Eugene Streets. Sidewalks. Bikeways and Accessways to <br /> include a section on Traffic Calming. <br /> The following traffic calming measures are recommended for use on existing and new streets in <br /> Eugene. <br /> Traffic Circles. Traffic circles are raised landscaped islands placed in the center of an <br /> intersection. Their primary purpose is to reduce speed and to separate intersection conflicts. <br /> Circles are especially effective in a series and may result in diversion of cut through -traffic to <br /> other streets.. Traffic circles are typically used on relatively low - volume residential streets. <br /> The recommended design standard for construction of traffic circles on existing streets consists <br /> of a set of two concentric rings. The outer ring is a mountable curb and is 23' in diameter. The <br /> inner ring is elevated above the outer ring, is 16' in diameter, and includes a vertical 6" curb. The <br /> two rings are connected by an area of sloping pavement. On new streets which may have a <br /> narrower width, the diameter of the circle will smaller but the general design concept should be <br /> retained. The center area may be paved or landscaped; landscaping is preferred for its aesthetic <br /> value. Traffic circle landscaping involves consideration of irrigation and long -term maintenance. <br /> These issues should be resolved before landscaping is chosen as the preferred option. <br /> * *INSERT PHOTO ** <br /> s9 <br />