Laserfiche WebLink
<br />Research Board (TRB) provides a figure showing a crash ratio (normalized to be equal to 1.0 at 10 <br />access points per mile) along a stretch of road compared with the number of access points per <br />, <br />1920 <br />mile. This figure is reproduced as Figure 6-1 below and is based on a national dataset of nearly <br />40,000 crashes. As shown, when there are more than 50 access points per mile, the crash ratio is <br />much higher and also increases more drastically than when there are 10 to 40 access points per <br />mile. <br /> <br />Note: <br /> The above figure demonstrates that the collision rate for a corridor would increase by 30 percent <br />if going from 10 access points per mile to 20 access points per mile. If the number of access points <br />increases from 20 access points per mile to 40 access points per mile (100 percent increase) the collision <br />rate would increase 62% (1.3 to 2.1). If the number of access points increases from 40 access points per <br />mile to 60 access points per mile (50 percent increase) the collision rate would increase 95 percent <br />(2.1 to 4.1). Therefore, when there are more than 50 access points per mile, the crash ratio is much higher <br />and also increases more drastically for each access point. <br /> <br />Figure 6-1: Ratio of Crashes to Access Density <br /> Poorly designed entrances and exits present a traffic hazard and cause congestion that can create a <br />21 <br />negative image for a shopping center. <br /> Multiple surveys indicate that the majority of business owners on corridors that have undergone <br />access management improvements believe there have been no declines in sales resulting from <br />,, <br />222324 <br />access management practices. <br /> <br />19 <br /> Gluck, J., H. S. Levinson, and V. Stover, 1999, Impacts of Access Management Techniques, NCHRP Report 420, <br />Transportation Research Board. <br />20 <br /> Lall, B. K., D. Huntington, and A. Eghtedari, 1996, Access Management and Traffic Safety, Paper presented at the Second <br />Annual Access Management Conference. <br />21 <br /> <br />Urban Land Institute, Shopping Center Development Handbook, Second Edition, Washington D.C., 1985, p. 101. <br />22 <br /> Eisele, W. E., and W. E. Frawley, A Methodology for Determining Economic Impacts of Raised Medians: Data Analysis on <br />Additional Case Studies, Research Report 3904-3, Texas Transportation Institute, College Station, Texas, October 1999. <br />23 <br /> Iowa Department of Transportation, Access Management Research and Awareness Program: Phase II Report, 1997 <br /> <br /> <br />th <br />West 11 Avenue Corridor Study September 4, 2009 <br />City of Eugene P07265-003-000 <br />41 <br />