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1.0 Introduction 1.1 Project Purpose This study examines the impacts resulting from changes in gravel truck traffic patterns from the Brannan Sand and Gravel Pit due to the construction of E-470 and the proposed changes in the local roadH~ay network. Adams County is concerned about the impacts these trucks will have on the local traffic operations, and has requested a traffic impact study from the E-470 Public Highway Authority, to be included in the submittal for a conditional use permit for the Brannan Sand and Gravel Company. I.2 Project Description The study area map is shown in Figure 1.1 . Brannan Sand and Gravel Company is located directly south of 132"" Avenue between Brighton Road and Nome Street. Gravel trucks from the existing gravel pit presently use Nome Street as the haul route to US 85 (See Figure 1.2). Due to the construction of E-470, the alignment of Nome Street in this vicinity will be absorbed by the new US 85 connector road to the E-470 alignment and 132nd Avenue will cul-de-sac east and west of E-470 (See . Figure 1.3 ). As a result of this change, the E-470 Public Highway Authority is willing to relocate access for Brannan Sand and Gravel from Nome Street to l32"d Avenue. Since132nd Avenue will no longer connect with US 85, gravel trucks from the Brannan Sand and Gravel Pit will need to travel west on 132"" Avenue to Brighton Road, north to 136'h Avenue, then east on 136`h Avenue to US 85. This is the proposed new haul route to US 85. 2.0 Existing conditions l.] Existing Roadway System The existing roadway system is shown in Figure 1.2. Currently, 136'" Avenue is a two-lane highway running east-west, and consists of 12 foot lanes with no paved shoulders. The posted speed is 45 MPH. This street is stop-controlled at the intersection of US 85, and at Brighton road, where it ends. Sight distance is adequate at both intersections. The intersection of 136'" Avenue and Brighton Road also coincides with the intersection of Nome Street and Brighton Road, creating an unusual 4-legged intersection. This intersection appears to be operationally unsafe, since the usual motorist right of way conventions cannot be applied. Nome Street is a two-lane highway running north-south between US 85 and 136'" Avenue/Brighton Road. The roadway consists of 12 foot lanes with no paved shoulders. The posted speed is 40 MPH. Nome Street is stop-controlled at both US 85 and ]36ih Avenue/Brighton road. Sight distance is adequate at both intersections. Currently, 132nd Street is a two-lane highway running east-west, and consists of 12 foot lanes with no paved shoulders. The posted speed is 45 MPH. 332"d Avenue is stop-controlled at the intersection of US 85, and at Brighton Road, where it ends. Sight distance is adequate at both intersections. US 85 is a 4-lane, median divided, major inter-regional route connecting the Denver area to Brighton and eastward. Agriculture and gravel mining are the major industries in the area. As a result, vehicle composition is between 4-5 percent