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trucks. The intersections of Nome Street, 132"a Avenue, and 136`h Avenue all have- <br />right turn acceleration and deceleration lanes painted into the existing 10 foot <br />shoulder on US 85. All intersections also have ]0 foot wide left-turn bays as <br />appropriate, that are approximately 250 feet in length. The length and width of all of <br />these auxiliary lanes are sub-standard for the posted speed of 65 MPH on US 85. <br />2.Z Existing Trajjic Controls <br />The existing intersection geometry and traffic control devices are shown in Figure <br />2.1. All intersections are two-way stop-controlled on the minor approaches as <br />shown. Advance warning signs informing motorists that trucks are entering the <br />highway are currently in place on US 85 between 124'" Avenue and Bromley Lane. <br />3.0 Proposed Conditions <br />3.1 Proposed Roadway System and Site Access <br />The construction of E-470 and the proposed US 85 connector road will eliminate <br />Nome Street and 132"a Avenue will cul-de-sac east and west of US 85 (See Figure <br />].3 ). As a result, Brannan Sand & Gravel Co. will need to relocate access from <br />Nome Street to 132"a Street. The proposed new haul route will be west on 132°a <br />Avenue to Brighton Road, north on Brighton Road to 136'h Avenue, then east on <br />]36'h Avenue to US 85. The future intersection geometry and traffic control is shown <br />in Figure 3..1. At the intersection of 136`" Ave. and US 85, right turn acceleration <br />and deceleration lanes on US 85 are painted onto the existing 10' shoulder, <br />producing fairly narrow lanes. In addition, these lane lengths average approximately <br />250 feet and are inadequate for the posted speed. The same is true for the left-turn <br />deceleration lanes on US 85, which are 10 feet in width, and approximately 250 feet <br />in length. <br />3.2 Site Trip Generation and Trip Distribution <br />Between 6:30 AM to 6:00 PM, Brannan Sand and Gravel sends out approximately <br />160 to 180 loaded trucks per day. This equates to approximately 320 to 360 trips <br />per day, or approximately 20 trips per hour, to and from the gravel pit. Based on a <br />conversation with the Brannan Sand and Gravel Company, these trips travel to the <br />south 80 percent of the time, and to the north 20 percent of the time, on average. <br />The life expectancy of the pit is estimated to be approximately 28 years from the <br />present. <br />3.3 Trip Assignment <br />The peak hour trip assignment is shown in Figure 3.3. The trip assignment is based <br />on the proposed haul route for gravel trucks to and from the gravel pit, and reflects <br />the proposed 2003 roadway conditions from the construction of E-470. <br />3.4 Existing and Estimated 2003 Background Trajjic <br />Traffic data was collected from Adams County and the Colorado Department of <br />Transportation, which shows existing traffic on the road network. Figure 3.4.1 shows <br />the existing ADT and peak hour traffic. <br />Based on the 2020 model generated by the E-470 Public Highway Authority, an <br />annual growth rate for traffic was determined for the area. This growth rate equates <br />to an approximate 80 percent increase in traffic by the year 2020. Based on this <br />5 <br />