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<br />TRAFFIC IMPACT ANALYSIS: Santa Clara School Site Redevelopment
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<br />PAGE 27 OF 36
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<br />7.
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<br />INTERSECTION PERFORMANCE
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<br />Relevant unsignalized and signalized intersections were evaluated to detel111ine Level of St'l"vice (LOS)
<br />based on delay as well as the calculated Volume to Capacity (Vie) ratio. Calculations for the
<br />un signalized intersections were perfi:.l11ned with the computcr program Highway CUll-acitv Softwarc
<br />(HCS-t} Version 5.2, by McTrans. Thc signalized intersection \vas evaluated using thc computer
<br />program SYNCHRO 7, by Traffic"'lare.
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<br />Level of service, based on vehicle delay, is classificd by a lctter scale from' A' to 'F'. LOS' A'
<br />represents optimum operating conditions and minimal delay. LOS 'F' indicates OYer capacity conditions
<br />causing unacceptable delay. LOS 'D' is generally considered thc minimum acceptable level of service
<br />by the City of Eugene. Mitigation measures may be nccessary when level of service falls below 'D' as
<br />the result of a development.
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<br />The LOS detel111ined by average delay per vehicle as established in the Highway Capacitv Manual. 2000
<br />is as follows:
<br />
<br />.~.
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<br />I-----u _nmmuu_____ u________u_______uu
<br />. - .: .: ". 'TABLE 5: LEVEL OF SERV'ICt-.CRITERIA - : ; ,..:;'_
<br />,'~. '~::) ,'-'.' --,.,.,', .~...; ." .,"'..i"~ ':.....4. .~~>....;"- :.,.,. .""-,,..",-' .,'..~."'.,.;:....("'"::"'.-':'\i".;.-,;., ..'i\. .....", . :;"':'; ........~'
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<br />Level of Service
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<br />Unsignahzed
<br />
<br />Signalized
<br />
<br />.J
<br />!
<br />
<br />.,
<br />i
<br />
<br />II
<br />t~..... -
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<br />A
<br />B
<br />
<br />C
<br />
<br />D
<br />
<br />E
<br />F
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<br />< 10 see
<br />>10 and S1 5sec
<br />>15 andS2 5sec
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<br />< 10 see
<br />> 1 0 and :S2 Osee
<br />
<br />>20 and S3 5sec
<br />
<br />>25 and ::~3 5see
<br />
<br />>35 and ::;5 5sec
<br />
<br />>35 and:::5 Osee
<br />> 50 see
<br />
<br />>55 and ::;8 Osee
<br />:> 80 see
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<br />Another measure of congestion is performed by di viding the number of vehicles utilizing a
<br />transportation fadIi ty by the calculated capacity of the facility, resulting in a volume to capacity (vic)
<br />ratio.
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<br />Mobility Standard
<br />The local TSP establishes minimum acceptable perfcnmance standards. The perf0l111anCe is measured
<br />by delay or vlc, depending on the applicable jurisdiction. As indicated in Transplan, the mobility
<br />standard tl)f city of Eugene is LOS 'D'. Based on the Oregon Higlnvay Plan, the maximum volume to
<br />capacity ratio for ODOT facilities is 0.90 for district/local interest roads. Lane County's maximum
<br />aUm,vable volurne to capacity ratio is 0.85 within the metro area. Capacity incrcasing are often
<br />necessary whcn the mobility standard is exceeded as the results of a development
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<br />!tiLr.:l:;J:~l_~}l__ l~_")!Lil!_~e(ng, (nc.
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<br />August 28, 2007
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