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8. B. - Page 44 7'ransportatran �mpacf Analy�es far Sif� L3evefopm�nt Table 7—Z. L�vel of 5ervzce Criteria for Signafized Ir�tersections Level nf Confro� De�ay per i��3tatiue pescrip�ran Servt[e Veh'scle {set} ,4 574 Goocs �rogress�on, few sr4ps and short cycle 1eng�hs. B � 10-20 Goc7d prqgressifln andlor short cyGIe lengths; €nare v�hic�e stpps. � >�� Fa[r proaressian andlar Eonger cycle Eengths; strme cycle fai�ures; significant �rflrtinn of vehides mus[ �np. � � 3 �� Congestion l�eeomes noticeahle; h€gh vofume-�o-capacity ratio; lor�ger de€ays: notic�abl� �ycle failu�es, � �� At ar beyond iimit c�f accepta�i� delay; �ioor pro�ression� lonc� tytfes; high votumes, Ic�ng qu�ues. �= � 80 � Unaccepta69e ta dri�ers. Arrival valurnQS gre�ter than dis- �harge capacity; long cycle lengths; unstahi�-unpredict�tafe fiows. SQURCE: 7ransportaiia� Aesearch Saard, 2C�0�_ VSThere an a;ency require5 �se flf a metl�od bth�r aec�ss s�.d.ies for ne�v�r dev�.apments, i� does �flY ti�an �te �rrent �Iia7�zen� Cttpacihf Mtzt�¢tQI proce- estimafelevels�fsen�iceforsi�,na]izedinterseetions. dures, tl�ai rnethoci s�iot�l�. be used to prcamate con- Tf a sib al�zed 'zntersecEi€�n L�S �nalysis is needed sistenc�T a�s►ona sEut3ie5 per�QZ'meci i� thafi jurist�ic- as pazt or �he �rans�ortation impaet and acc�ss �ior�, �,acal standaras, �s�T> dacun�ent�d, sl�tould stszdy� �hen apera.tio�ai a��alys�s 'cvi,l� be required. be appl�ed. '�`kte opera�ionsl anaIysis sl�auld aLso be us�d toz' anely�ing exisEing canctztior�s ar fi.z�ure co�ditions 'I'he overa�l int�rsec�an �.OS is dee�n.ed t�e a��ast in ��TT�c.h traf.fzc, geomeEric az�d con�rol �Saran2et�rs �portan� for signalize�l intersec��zons. �'or Ehnse can be estabiishecl based o�� projecfians and c��si� signs�zed intersec�ions t.�iat includc turnin.g sketches. It is recc.ai�znzen�erl �hat Ie^ve�, a£ sex��ice ��ven�ents �n�iti� unacceptab�e LOS, 111t vc�lu�ne f�r er.istin� �nndi�as3s be con£zrr.rted thro�x�� eid to ca�aci�y rafio C�Jc) and/ax del��y per vehicl� rrbsertra�an ��vhez�ever possi3�le. Ti�is wi11 help rai�a sho�zl�i. be calculafied tp fur� illu.sErate i11e vezify assuzriptians. rela�ionship af these ktvo evalua�ian �axan�eters. E�ch agency �zsua�y sets �ts awn zzzinimum unsignaiized fn�erse[fiiaras acceptable I,C3S s�anriards for its interseetions. Level of service ana��s�s fnr both t `I'J.�e 9xztexsect�ion �.C7S is corn�uted as a tveighied contro�ed CI'bVS�) and all-waq-stop-cnn�rc��l�d avera e of the vel�icle deia�;�. A�.� int�rs�ctinn ma E��h SC) intezsections depend upon a cIear descrip- � y tian and zzndesstandin� a.f �te interac�nn of drit�- tl�us have an ficceptable atrerall L�S a.n�, have an- ers an �I�e contro�i.ed �p�rcac��s v�ith c�ivers o� dividual znovemer�� a*�th u�accepiable LC3S. As �coniro?�ecl approa��es {Sf any). Both ga� �CC�p- a result, aIl a�overnents shouid i�e analyzed indi- t�c� anc� ernpirical zrrB�els l�ave be� develnped vidax�iy. When reeornmez�dat�nns are formulated, to describe tI zz�ter�e�ian. A.ddi�ionaI i�formation ��zey sltc�ulct znclude modifzcations to red��e de3ay gn oap analysis can be #ound izi the rVtnnunl of Tr•ntzs- and inca'ease capaci�y a� criS�cat moveinents. T�e �ortc�fio�� EFagiz�eerilzg Stu�ies (Rabertson, 20�fl). mad€fications ma�r u�clude add.ing lazies, reducir�g fr�ction (such as rema� eurb parkuGg?, chang- Ler�ei o� ser��ice far TWSC a�d AWSC inter�ecEior�s u�g, sigu� pl�asina ar timina, or re-dixecting critical � mov�n€en.ts. is determu�ec� by coznputiztg ar measuxzng cs�ntrol delay. �ar TWSC interseetions, at is comp�.tted a�d Twa Ievr�3s af ana�ysis are avai�able for camputin� �� °r each �ittaz approadl. Level of service Ievel af ser��ce---opera�c��a�a�alysis and plaz�ing is nat de.fi.zied fox i�kre intersection as a'vr�iole (as anaIpsis. AIthaubt� tite plal�ni�t; analysis is usually il is fe�r s9a aiizeci i�t�rseciions). �ar AVdSC inter considered adeqLiate for transpnrta�an impact and seC�ions, zt is independent]y cpmputed and de£z�ed 62