Capital Hill PUD Traffic Safety Analysis <br />(Revised) May 17, 2017 <br />Applying the calculated rate of 4.53 trips/dwelling unit/day to the site's potential 37 new <br />dwelling units in the post-development conditions, the site's contribution to the daily traffic <br />volume on Capital Drive would be 168 new daily vehicle trips. Assuming two existing residences <br />that appear to be currently unoccupied on Capital Drive north of Cresta De Ruta Street are <br />occupied at build-out, their contribution to the daily trip generation would be nine (9) additional <br />daily trips, and the total ADT of Capital Drive would be 235 average daily trips north of Cresta <br />De Ruta Street. The projected 235 ADT in the post developed conditions accounts for existing <br />traffic, occupancy at the two currently unoccupied residences, and post-development traffic <br />resulting from build-out of the site as planned. Assuming the 29 AM and 38 PM peak hour trips <br />occur during those peak one-hour periods, the average hourly trip generation contribution from <br />the site would be less than five trips per hour during the other 22 hours of a typical weekday. <br />The 29 AM peak hour trips would result in one vehicle trip every two minutes during the highest <br />morning one hour period, with most of those trips exiting the site. The 38 PM peak hour trips <br />would result in approximately 3 vehicle trips every 5 minutes. <br />A comparison of the trip generation rate derived from collected tube count data on Capital Drive <br />per unit to the applicable published national average daily trip generates is made in the <br />following table: <br />Existing Residential Properties north of Cresta De Ruta Street: <br />Existing <br />Occupied <br />13 <br />- <br />- <br />59 <br />4.53 <br />Residential <br />Dwellings <br />Proposed New Residences at Capital Hill Site: <br />Single <br />Family <br />Dwellings <br />28 <br />9.52 <br />267 <br />127 <br />4.53 <br />Detached <br />Multi- <br />Dwellings <br />9 <br />6.65 <br />60 <br />41 <br />4.53 <br />Family <br />Proposed New Development Totals: <br />327 <br />168 <br />4.53 <br />In addition to the traffic volumes displayed above, the additional two vacant residences that <br />were not occupied during the traffic data collection period would generate an additional 19 daily <br />vehicle trips per the ITE rate, or approximately 9 ADT trips per the derived rate from collected <br />traffic count data. <br />3.3 Construction Traffic <br />During the neighborhood meeting, a question was raised about construction traffic. <br />Construction traffic is considered a temporary traffic condition, with a limited finite duration. <br />The level of construction traffic that will result from the proposed development on the site will <br />be consistent with construction traffic that served to construct the existing residences on Capital <br />© Branch Engineering, Inc. <br />Page 1 10 <br />