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<br /> ' <br /> tiorts--en-th er~ectiorrs--with <br /> E;agene-'-s-ceHeetors-and-ante e-half.-] ?he <br /> total .equivalent signals equal the total signals under Eugene's jurisdiction ptras <br /> ope-half of the shared jurisdiction signals. Dividing the total equivalent signals by <br /> the atal .number of lane miles of ar'tertiat and collector streets_(a figure.. derived from <br /> Eugene maintenance records. after subtracting turn lanes. from the inventory), <br /> yields the total percent of signalized intersections per lane mile. [phis-gietds--a <br /> fern-signs} e <br /> ~tr"eg ertance <br /> lcls~-stgrtatrted <br /> Once again, it was judged unlikely that the density of signalized intersections in the <br /> downtown area would be repeated in newly-developing parts of the City. Accordingly, <br /> the number of signalized intersections per mile was reduced to reflect .this-factor. <br /> Estimates for the average cost of , signaiization per intersection include <br /> administrative and engineering costs: This estimated `average cost,is multiplied <br /> by the percent pf si9nalized intersecttons per lane mile to calculate a componerrt <br /> cost pe'r lane mifie for #raf#ic signals. 77tis cost per lane mile for signalization !s <br /> added to the cost per line mile of arterial and cailectoX, streets. f@35-permii~- <br /> 39~9@-per <br /> 1.3.4 Bridges and Other Structure Costs <br /> It is likely that additional bridges will be constructed as development occurs. <br /> {~tss~xming] I_~5.;~;~>?t71~~~ that bridges required for new development will be in <br /> proportion to existing development,'~b»:er~, the City of Eugene's inventory of its bridge <br /> system, I~tcl~t~(~p~ >li~~t~t ~t~~3i~~ge end d~ra~ d]. <br /> Several of the bridges are on local streets and are, therefore, not appropriately inGuded <br /> in the cost calculation for arterial and collector streets. It was also judged unlikely that <br /> the close spacing of bridges over the Mill Race and Amazon Channel in the vicinity of <br /> downtown Eugene would be repeated in newly-developing areas. Accordingly, half of the <br /> short-span bridges in the central Eugene area were eliminated from the cost calculation. <br /> In addition to the small structures, the Ferry Street Bridge and the Ferry Street Overpass <br /> were listed in the invento Construction costs <br /> y~J ~y y~ ~y rY• -y~~~~~y ,~Fy(~~ `fof-tlhese},~yy~ reip~,,,},,t,,~,aidL,, ~ryiE~,#t~cl~l~w$ <br /> R4~1'(Fl~~ilt~'1~~~5'~~/i~`~~r~'VV=lWf,.?~!~w 5i?1C iIF' T~tfr{S. ~#i~?R~4 i!y ~i~ t~l~iR~ <br /> lane rrri!!es:~'or the Guy's arterial and txrll+iior sy~lf#1r~ arirage d~3t per <br /> lane ft'lle .ft~t fir`l~dge +s~lr~tctur , <br /> Proposed Methodologies: City of Eugene SDCs (Effective March 01, 1997) Page C-7 <br /> <br />