10-02-2017 Council Packet - Laserfiche WebLink

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If the 85th percentile speed is greater than 33 mph on a roadway posted at 30 mph, a speed concern would be identified at that location. If the 85th Percentile speed is greater than 33 mph but less than 35 mph, the speed concern will be brought before the City Council to consider the feasibility of low cost measures as a means to calm traffic. Some low cost traffic calming measures include: • Education • Lane narrowing (striping or tubular marker island) • Pavement messages (30 MPH, SLOW, etc.) • Additional signage • Speed Awareness Display signs If the 85th Percentile speed is greater than 35 mph, the speed concern will be brought before the City Council to consider potential engineering solutions as a means to calm traffic. These solutions are typically higher in cost. Examples of possible solutions include: • Lane narrowing o Raised concrete or landscaped island / median • Curb extensions o Mid-block chockers (concrete or planters) o Neckdowns (Bump-outs at intersections) o Chicanes • Roundabouts o Full size roundabout o Mini-roundabout o Neighborhood Traffic Circle • Speed Awareness Display signs • Raised intersection/crosswalks • Roadway alignment revisions (adding curves to a straight roadway) Funding: Upon the recommendation of City staff and approval by the City Council, the appropriate measures will be implemented by the City once funding is secured. Possible funding sources include: • Inclusion in the City’s Capital Improvement Plan (CIP) • Special request from the City Council • Assessment process Review: Following the installation of the traffic calming measure(s), a review period for up to nine months will be initiated to measure its effectiveness and determine if the objectives were met. At the end of the review period, an evaluation will be conducted based on the following criteria: Figure 1 represents the decision diagram used in the speed concern evaluation process.