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■ Limited visibility on approach to an intersection or roadway condition requiring <br /> warning, as determined by the sight distance criteria for Warrant 1 in Section 9- <br /> 4.02.012 in the Traffic Engineering Manual. <br /> ■ A history of crashes documented to be caused by a failure to stop or adherence to <br /> implementation of conspicuity improvements. <br /> warning, and deemed preventable by <br /> Speed Feedback Signs <br /> These signs provide a real-time dynamic display of the driver's vehicular speed at the <br /> location where speeding and safety has been documented as a problem. When considering <br /> use of these signs, at least four (4) of the following conditions must be met: <br /> ■ The 85"'percentile speed exceeds the posted speed limit by at least 5 MPH during <br /> the time period of concern. <br /> ■ A speed transition area exists. <br /> ■ The area of interest is within the vicinity of a school or other high pedestrian traffic <br /> area. <br /> ■ The posted speed is 40 MPH or less. <br /> ■ The road is under city jurisdiction. <br /> Installation may be considered when three (3) of the above five (5) conditions are met, and <br /> crash data and documented repeat lane departures can clearly be linked to excessive speed in <br /> the area of interest. <br /> Speed Feedback Signs shall also meet the following technical specifications when <br /> implemented: <br /> ■ Installation must be used in conjunction with the traditional speed limit sign. <br /> ■ When activated, the sign display shall give drivers immediate feedback on their <br /> individual driving speed. <br /> ■ When traveling above the posted speed limit, the sign shall rapidly flash or have <br /> other dynamic elements. <br /> ■ When installed in association with school speed zones, the Speed Feedback Signs <br /> shall operate only when the school speed zone is in effect. <br /> ■ The installation shall not interfere with the visibility and general effectiveness of any <br /> other signs in the area. <br /> Rectangular Rapid Flashing Beacons (RRFBs) <br /> RRFBs are user-actuated LEDs that supplement warning signs to increase awareness of a <br /> pedestrian crossing location. They are activated by a push button which triggers the LEDs to <br /> display an irregular flash pattern which can help alert drivers of the approaching crosswalk. <br /> Prior to implementing RRFBs,the following conspicuity improvement alternatives shall first <br /> be considered: <br /> ■ Add crosswalk pavement markings. <br /> ■ Install an advanced warning sign on approach to the crosswalk. <br /> ■ Increase the size of the existing signage. <br /> ■ Install a second sign of equal or lesser size on the left-hand side of the road (if <br /> allowed by MN MUTCD). <br /> 0 <br />