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HomeMy WebLinkAboutIFAC - LEVEL OF SERVICE FOR UNSIGNALIZED INTERSECTIONS - 1991 Table 2-4 Level of Service (LOS) for Unsignalized Intersections 094x1 Conditions) A.M. Peak Flour P.M. Peak Hour Intersection Major Street Minor Street Major Street Minor Street Rouse Avenue &Peach Street A C/C A E±/F Rouse Avenue&Tamarack Street A A/C A D/D Rouse Avenue&Babcock A B/C A C/D 1 Wilson Avenue&Mendenhall A F/C A F/F South 11th&College A E/D A F/F South 39th&College A C/C A D) Forth 7th&Griffin Drive A F B F Kagy Boulevard&Willson Avenue B E A D Traffic volume checks were made at these locations to determine current signalization needs. A signal warrant analysis for unsgnalized intersections is contained in Chapter 5 of this flan. 2.5 Accident Analysis As part of the Transportation Plan Update, an accident investigation was conducted to 4 identify accident characteristics and high accident locations in the Bozeman urban area. 4 Summaries of accident records for the road and street system were obtained from the Highway Information System (HIS) maintained by the Montana Department of Justice, Highway Traffic Safety Division. All reported motor vehicle accidents for the period from January 1, 1988 through ]December 31, 1990 were reviewed for this analysis. Urban Study Area Accidents - A total of 2,380 motor vehicle accidents were reported within the urban study area during the three-year period.This,accident total included five fatal accidents and 654 injury accidents,producing five fatalities and 867 injuries.Property damage only (PDO) was recorded in 1,721 of the reported accidents during the period. The HIS accident data also revealed other pertinent statistics for the study area such as: 2-13 l E Table 2-3 Level of Service (LOS) for Signalized Intersections (19"91 Conditions) Overall LOS Overall LOS Intersection (A.M. Peak Hour) (P.M. Peak Hour) West Main/College Street/Main Mall B B West Main/19th Avenue C* C* West Maln/15th Avenue B* Q West Main/11th Avenue B B West Main/8th Avenue B B West Main/North 7th Avenue B B West Main/5th Avenue B B West Maln/G rand Avenue B B Main/Willson Avenue B B East Main/Tracy Avenue B B East Maln/Black Avenue B B East Main/Bozeman Avenue B B East Main/Rouse Avenue B* C* Babcock/Willson Avenue B B Mendenhall/Rouse Avenue B B Mendenholi/North 7th Avenue B B North 7th/Durston Road/Pesach G* D "Denotes Intersection wOth at least one approach operating at LOS D or below during peak tours. Unsignalized Intersections - The level of service can be analyzed for locations where "Stop" or "Yield." signs are used to control traffic on one of the intersecting streets. In this analysis, the distribution of gaps (spaces) in the conflicting traffic stream on the major street, and the ability of motorists on the side streets to execute their desired maneuvers during available gaps are the primary considerations. Level of service criteria are ex- pressed in terms of general delay to minor street traffic, and the reserve capacity of the specific approach lane being evaluated. Major unsignalized intersections in the Bozeman area were evaluated to determine their current LOS. The results of these analyses are presented in TABLE 2-4. 2-I2 Table 2-6 Identified Problems on the Major Street Network Signalizatlon Accident Approach Poor Level Problems/ Location Problems Delays of Service Needs Other South 6th and Olive ► West Main and Grand South 8th and West Main Street : 3 North 5th and West Main Street * 4 Main and Willson * Congestion East Main and Black Avenue East Main and Church Avenue rt Babcock and Willson Geometrics East Main and Wallace * 3 Sourdough and Goldenstein * Limited Sight Distance East Main and Highland r Kagy and Highland + Limited Sight E Distance /Speeding Babcock and South 8th 3 South 9th and Olive East Main and Bozeman Street East Main and Tracy Street • t-Approach delays 25 seconds or greater 2.Overall LOS for intersection D or below(AM/PM peak hours) 3-At least one approach operating at LOS D or below in peak hour 4-Knor street operates at LOS D or below unsignalized intersection 5-Need to modify signal timing/phasing to optimize operation of signal 2-19 Table 2-6 Identified Problems on the Major Street Network Signalition Accident Approach Poor Level Problems/ Location Problems Delays of Service Needs Other P1 East Main and douse _ * 3 Babcock and Tracy = P1 1-90 Interchange(East Bozeman) P1 —v Babcock and Rouse , * 4 PM P1 Nta tist,��Irta�a = Geornetrics Rouse Avenue and Peach STreet a PM Uncontrolled Story ill and'Mclllhatten � Intersection /Limited Sight Distance Vllard and North Grand Willson and Mendenhall = North 7th and Tamarack Griffin and North Rouse Rouse and Tamarack * 4 PM 5t�a1�1'kr�►.�;�i.i �i>�il�l;tlt= ', College/Main Mall Ent./West Main = X AM = 4 'West Main&l=ast Entrance to Mall = tWe:stMai:n& 9t h.Avenue = 3 uth 19th&Babcock Avenue = 1.Approach delays 25 seconds or greater 2-Overall LOS for intersection D or below(AWPM peak hours) 3-At least one approach operating at LOS D or below in peak hour 4-Minor street operates at LOS D or below-unsignaiized intersection 5 -Need to modily signal timing/phasing to optimize operation of signal 2-2a I Identified Problems oTable 2-6 n the Major Street Network Accident A�e�a as Signalizatio n Location Po L Problems Y of Service Needs Other West Main&North 15th Avenue rt 3 4 Koch&'South 11 th Avenue rt Sight Distance Obstructions i South 9th&Olive rt Uncontrolled >, Intersection South 7th&West Main rt 3 South 7th&Harrison V South 8th&College , South 3rd&Goldenstein(East) South 3rd&Goldenstein(West) South 19th&Kagy Boulevard rt II I South 11th&College Street * 3 4 AM/PM South 19th&College Street rt 3 4 PM 11th Avenue&South 19th Avenue West Main& 11th Avenue I US 191 &Ferguson Road , .. NorE1esi`#3csxetraifX West Main&North 7th p * 3 North 7th& Durston/Peach rt rt rt 3 AM/PM North 11 th&Durston 3 North 15th& Durston rt 1-Approach delays 25 seconds or greater 2,Overall LOS for intersection D or below(AWPM peak hours) 3-At least one approach operating at LOS D or below in peak hour 4-Minor street operates at LOS D or below-unsignalized in tersection 5-Need to modify signal timing/phasing to optimize operation of signal 2-21. Table 2-G Identified Problems on the Major Street Network Signalization Accident Approach Poor Level Problems/ Location Problems Delays of Service Needs Other North 9th&Lamme Street North 7th&Mendenhall North 7th&Wheat/Nickks North 7th&Griffin/Mandeville * 4 AM/PM North 71h&W.-bound 1-90 Ramps North 19th& Baxter North 8th&Mendenhall 1-90 at North 7th Avenue Secondary 205 1-Approach delays 25 seconds or greater 2.Overall LOS for intersection D or below(AWPM peak hours) 8-At least one approach operating at LOS D or below in peak hour 4-Minor street operates at LOS D or below-unsignalized intersecton 5-Need to modify signal timing/phasing to optimize oppration of signal 2-22 Existing Conditions greater Bozeman Area Transportation Plan, 2001 Update TABLE 2-3 1999 Level of Service LOS for Unsi nalized Intersections A.M. Pear Dour P.M. Peak Hour Intersection Major Street Minor Street Major Street Minor Street N.19 and Baxter A B/D A F/F N. 7th and Griffin A A/F A C/F Rouse and Griffin A C/B A C/B Story Mill and Bridger Canyon Dr. A B/A A B/A Rouse and Oak A B A C Rouse and Peach A B/B A C/D U.S. 191 and Cottonwood A E/F A F/F U.S. 191 and Fowler A F A F E. Main and Wallace A B/C A B/F S,11 m and College C C D D Willson and College A C/D A F/E S. 1 9th and Kagy B B A S. I 1 and Kagy A B/E A B/F Kaq y and Sourdou h A D/B A C/C S. 19th and Goldenstein A A B The LOS analysis of the unsignalized intersections in the Bozeman area shows operational problems at seven intersections including: North 19th and Baxter; North 7th and Griffin; U.S. 191 and Cottonwood; U.S. 191 and Fowler; East Main and Wallace; Willson and College; and South 11th and Kagy. 2.5 Travel Speed In an effort to determine general traffic and delay patterns, a travel time and delay study was performed. Six routes were identified which include most of the major traffic routes through the area. Each roadway segment was traveled 12 times (six times in each direction) using the average-car-analysis method during peak hours. This information was used to determine the average travel speed and running speed, as well as intersection delay for each corridor. Travel speed is defined as the speed at which a vehicle travels between two points including any delays. Running speed refers to the actual vehicle speed while the vehicle is in motion (travel speed minus delay). The information presented in FIGURES 2-5 and 2-6 illustrates the results of the travel time and delay studies. In most areas the average travel speeds were relatively close to the posted speed limit for the routes. Major intersection delays (greater than 25 seconds of average stopped time) were experienced at several intersections. The intersections and specific approaches where these delays occurred are listed below: Robert Peccia &Associates 2-10 Greater Bozeman Area Transportation Plan(2007 Upstate) Chapter 2:Existing Conditions Table 2-5 2007 LOS (Stop-Controlled Intersections) INTERSECTION AM G PM.., 1N 1 F tS C I I©N AM PM Frontage Road&Nelson Road C N C Jackrabbit Lane&Valley Center Road 1)_,. ( E - Frontage Road&'Valley Center Underpass C E Jackrabbit Lane&Hulbert Road C D _ ._.w ........ __..... ..__... __ _._, _w.__.._ _____ ___ _ __..._.- Highland Boulevard&Ellis Street C E Jackrabbit Lane&Baxter Lane C D Highland Boulevard&Kagy Boulevard E C Jackrabbit Lane&Durston Road C D East Main Street&Haggerty Lane W C E Jackrabbit Lane&Ramshorn Drive D C Haggerty Lane&Bozeman Trail Road A A Jackrabbit Lane&Forkhom Trail E E Kagy Boulevard&Bozeman Trail Road B B Jackrabbit Lane&Shedhorri Trail C jl E Ka Boulevard&Sourdough Road F F Jackrabbit.Lane&Spanish Peak Drive C C Main S Street&1-90 Off-Ramp � C B Huffine Lane&Monforton School Road B C Maim Street&1-90 On-Ramp B B Huf£ine Lane&Love Lane C C Story Mill Road&Badger Canyon Drive B C Huffine Lane&Gooch Hill Road B C North Rouse Avenue&Peach Street C C Valley Center Road&Harper Puckett Road B B .. South 11th Avenue&College Street D F 8th Avenue&College Street C D College Street&Willson Avenue E F U5.191&Gooch Hill Road B C South 11th Avenue&Kagy Boulevard D F U.&191&Mill Street C C South 19th Avenue&Goldenstein Road B mmB U,&191&Cottonwood Road B C Jackrabbit Lane&Cameron Bridge Road D i F The LOS analyses of the existing conditions in the Greater Bozeman Area reveals that several signalized and unsignalized intersections are currently functioning at LOS D or lower. These intersections are shown in Table 2-6 and are ideal candidates for closer examination and potential intersection improvements measures. Refer to Table 4-3 in Chapter 4 for a detailed performance level turning movement breakout for each unsignalized intersection. Robert Peccia&Associates,Inc.!ALTA Planning+Design 2-19 Greater Bozeman Area Transportation Plan(2007 Update) Chapter 2::Existing Conditions Table 2-6 Existing Intersections Functioning at LOS D or Lower INTERSECTION AM PEAK P1V1 PEAK � 8tth Avenue&College Street ( U I C D College Street&Willson Avenue U E F East Main Street&Haggerty Lane i U C E Frontage Road&Valley Center Underpass U C E Highland Boulevard&Ellis Street U i C E Highland Boulevard&Kagy Boulevard U C Hu££ane Lane&Ferguson Road S E — E Jackrabbit Lane&Cameron Bridge Road U D F Jackrabbit Lane&Valley Center Road U D E jackrabbit Lane&Hulbert Road U - jackrabbit Lane&Baxter Lane I — C D ..._...._..... _._...... jackrabbit Lane&Durston Road U C D jackrabbit Lane&Ramshom Drive U D C Jackrabbit Lane&Forkhorn Trail U F E jackrabbit Lane&Shedhorn Trail U C E Kagy Boulevard&South Willson Avenue S D D Kagy Boulevard&Sourdough Road U F F Main Street&7th Avenue S C E Main Street&Babcock Street S C D Mann Street&Haggerty Lane BJ C - Main Street&Highland Boulevard Main Street&So 19th Avenue � F � _ D North 7th Avenue&Durston Road S ' _ D D North 7th Avenue&Oak Street S C 4 D South 11th Avenue&College Street U D � F South 11th Avenue&Kagy Boulevard U D F West College Street&South 19th Avenue S E F (S)ignalized (U)nsignalized 2-20 Robert Peccaa&Associates, Inc.1 ALTA Planning+Design