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C E C 15 1992 <br />2. Accident History: <br />Collision diagrams which illustrate the frequency,type, <br />and pattern of accidents are attached for the years 198! <br />and 1982. As shown in the tabular summary below, left turn <br />and right-angle type collision patterns predominate. All <br />left -turn collisions involve vehicles turning from Seven- <br />teenth Street. Accident seriousness is relatively low with <br />an injury rate of 22%. <br />Collision Summary <br />Collision Tyne 1981 1982 Total <br />Right -Angle <br />1 <br />2 <br />3 <br />Left -Turn <br />3 <br />1 <br />4 <br />Rear End <br />1 <br />0 <br />1 <br />Sideswipe <br />0 <br />1 <br />1 <br />(Injuries) <br />1 <br />'1 <br />2 <br />The accident frequency rate (per million entering vehicles) <br />has increased slightly from 0.71 to 0.94 during 1981 and 1982, <br />respectively. <br />It <br />3. Traffic Control: <br />The present traffic signal is operated through fully actuated, <br />8 -phase capacity, controller approximately 3 years old. <br />No operational or design deficiencies exist. <br />Current signalization utilizes 5 of the 8 available phases: <br />4l Seventeenth Street left turns <br />02 Seventeenth Street through <br />03 Sixth Avenue left turn(southbound) <br />�4 Sixth Avenue through (southbound) <br />�5 Sixth Avenue through (northbound) <br />Phasing skipping (resulting from lack of vehicular actuation) <br />and overlap (combination of phases) features operate properly. <br />Signalization warrant analysis based on provisions in the <br />Manual on Uniform Traffic Control Devices confirm the need <br />for intersection signal control. Left -turn exclusive phase <br />warrants were also investigated, supporting the need for <br />such phasing on 17th Street only. <br />Pavement markings are in poor condition for the 6th Avenue <br />approaches. Centerlines and turn lane lines are undefined. <br />4. Alternatives: <br />A. Refurbish all pavement markings on the 6th Avenue approaches <br />as follows: <br />1. Refurbish double yellow centerline; <br />2. Define left -turn lanes, including turn arrows <br />as required; <br />3. Refurbish white stop bars. and crosswalks. ., <br />B. Revise signal phasing by deleting the 6th Avenue left - <br />turn phase (change to 3¢). <br />C. Maintain existing signal phasing. <br />D. Revise signal phasing by adding a left -turn phase to <br />6th Avenue northbound (change to 66). This alternative <br />will involve purchase of an additional phase module ($ <br />conversion/addition of two five -section signal heads ' <br />($700.00), and addition of one loop detector ($150.00). <br />