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3a�es Lehnhoff, AICP C�ty of 1-�rden Hills County Ro�d F and Lexi�gton �-lvenue December 7, 2009 Page 14 • Constructio� of an addi��onal northbo�nd Ie��.-�urn lane Is reco�nmended. �'his wii� require modi�cation o� tl�e west approach of CR F at Lexin�ton Avenue to receive the additianal Ieft-turn �ane. The addlt�ona� turn ]ane wi1l reduce the amaunt of gr�en time necessary ta accommodate the left-turn moveme�t, which can then be provided to other r�ovemer�ts. Minor queuing on the eastbc�unc� approac� may occur during the p.m. peak �our. e 1� potential improvement that is necessary to improWe th� safety at the intersectio� is the addit�on of a southbour�d right-turn �ane. Thi� will elim�nate the conflict hetween r�gh� turnrng veh�cIe� and throu�h vehicies, and likeiy reduce t�e potentia� for rear-end type crashes. �t shauld be noted that alI improvements recommended above are consistent with the Boston Scien�ific Campus Master P�an and w��I provide acceptable overa�� intersection levels af service. CF�ASH ANALYSIS �'o determine �f there are any safety issues tha� need to be addressed� a review of recent crash data was completed. Crasn data reported ta Mn/DOT during the five-year period from 2003 through 2007 �vas analyzed to ac�dress traffic safety in the stud}j area. The crash analysis results �re summa�ized as follo�vs: � Seventy-two (72} crashes were reported W1��11�'] the study area dur�ng the five-year period frorrl 2003 through 2007. The number of crashes by loeation ranged from a high o� 48 reported at CR F and Lexington Avenue to a Iow of two (2) reported at �R F and Innovation VVay. • In order to determine the signTficance of these crashesa �he associated crash rates fo�- these �ocat�ons were ca�cuIated. C��ash rates are numerical values th�t corrlpa� e or�e part�cular intersection to intersect�ons of similar charaeteristics. Crash rates for roadway se�ments are compa�-ed with other roadway se�r�ents o� similal- charaeter�stics. The c�lculated crasl� rate for ��e study area is shown rn Table 5. iable 5 Crash Analysis Intersection Calculated Average Cr�tieal Crash Rate Crash Rate Crash Rate County Road F and Hamline Avenue (So�thbound) 0•�8 0.20 Q.73 ::::�:: .:: �ounty Road F ar�d Hamline Avenue (Northbound} : �.�� ;: Q-24 0.69 County Road � and Innovation Way 4.15 0.20 - County IZoad F and Lexington Avenue 1.01 0.70 1.2Q Segment �ounty Road F(Ham}ine Avenue to �nnovation Way} 0.49 2.14 - Co�nty Road F(Innovatiop Way to Lex�n�ton Avenue} Q.49 2.10 - No�e: '�'I�e crash rate is reported in te��rns of cras�es per million entering vehicles.