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Home My WebLink AboutSP202100017 Study 2022-08-03\ TERRA ENGINEERING AND LAND SOLUTIONS, PC 2374 STUARTS DRAFF HIGHWAY, STUARTS DRAFT, VA 24477 PH. (540) 337-4591 FAX (540) 337-5291 Foster Forge Farm School Albemarle County, VA Turn Lanes Analysis and Study Report May 04, 2022 Revised May 10, 2022 Revised July 26, 2022 Revised July 29, 2022 TH Op G� t TEVEN L. DRIVER Y NO.019933 �YSSIONAL �� PLANNING + CIVIL ENGINEERING + LAND SURVEYING W W W.TERRAENGINEERING.NET TRAFFIC STUDY NARRATIVE The latest revised TIA is based on a collaborative zoom meeting with County staff and VDOT. Regulatory attendees included Doug McAvoy, Jr, PE, VDOT, Kevin McDermott, Albemarle County Planning Manager, and Scott Clark, Albemarle County Senior Planner II. The turn lane warrant study revisions per zoom meeting include: 1. Based on 60 student population, all other school use traffic is captured in Land Use 522 ITE edition 10 data is used 2. The study period is from 2015 to 2019 3. 2020 and 2021 covid years background traffic not factored in per VDOT The counts in those years are 6,000 VPD in 2020 and 6,600 VPD in 2021 4. Background Barracks Road traffic volume based on 7,200 VPD in 2019 5. The growth rate suggested by County is 1%. 6. The design Year is 2025. 7. Left turn movements occur in a posted 45 — 50 MPH speed transition zone. The study uses a 50 MPH full -zone posted speed. Design Criteria and Application Revision Summary: The study is based on as -is road conditions. The approved Field School will change the characteristic of this road corridor as will Foster Forge Farm School. Summary: • Land Use 522 is the basis for site traffic generation. • Turn warrants are based on Peak hour, AM, and PM. • The peak hours occur between 7-8 and 5-6, respectively, for AM and PM. • School hours are from 8:30 am to 3:45 pm. Drop off and pick up will occur before and after these hours. • School events occur after 6 pm or on weekends and do not contribute to peak -hour traffic. • Animal caretaking occurs by staff on -site during the weekdays and on weekends and does not contribute to peak -hour traffic. • Left turn lane warrants depend on advancing and opposing traffic volumes which are derived from background traffic and left turns, but also depend on the percentage of left turn volume to advancing volume and posted speed limit. Peak left turns are 10 and they occur in the AM. • Peak -hour right turn warrants are only based on PHV approach total and PHV right turns and are 9 and they also occur in the AM. Right turns are unobstructed. Regarding right turn road improvements, they can be taper only or full right lane and taper combined. Taper only is not warranted until 20 peak hour right turns are reached. Right turn lane and taper combination is not warranted until 40 peak hour right turns are reached. Again, 9 is the peak. Regarding left turn warrants, the highest background traffic volumes are used (2019). The graph below demonstrates that the background traffic volume used in the study is conservative when compared to the last several years of recorded data going back to 2005 and ignores current conditions for the last two years which are also much lower traffic volumes. There are no values higher than what used in this study since 2001, except 2005. e000 ]800 7200 ism 7 AADT Based on VDOT Historical Data 2001-2021 —gym 72W 72W -- — — 6700 0 . 6800 g 7300 7000 �O0 7000 6600 W00 6900 csoo 6100 / 6000 640p f!^d 6300 \ 57M 5900 ssoo I 8 8 8 8 8 8 8 8 8 8 8 8 8 8 S 8 S S 8 S 5 S 5 g Regarding site traffic generation, this is a small private school which is absent of traffic -producing elements commonly found in larger schools such as cafeterias, janitors, etc. As a result, the utilization of Land Use 522 data is conservative when adapted to Foster Forge Farm School. Conclusion of right turn warrant: Peak hour turns are 9 occurring in the AM No Turn Lanes or Tapers Required. Conclusion of left turn warrant: Peak hour turns are 10 also occurring in the AM No Left-Turri Lane Required Recommendations: Although turn lanes are not warranted and inclusion of a left turn lane is not economically feasible for a small 60-student school, to mitigate traffic safety concerns, one or more of the following is recommended: 1) Move the entrance as far west as possible to increase the separation distance from the curve at Montvue Dr. and allow westbound drivers more time to slow if needed. 2) Request a waiver from VDOT to reduce the 660' entrance separation distance to accommodate a westward shift of the Foster Forge Farm School entrance. 3) Add a right-tum taper to the site. 4) Board of Supervisors can further enhance the traffic safety by initiating a request to VDOT to provide School Zone signs and posted speed signs in accordance to the County approved Field School along this section of Barracks Road commensurate to Virginia Code 46.2-871 which addresses the speed of buses in 55 MPH or less posted speed zones. 7643 Conclusion: Considering that the highest value of background traffic over the last two decades, excepting year 2005, has been used as the basis of the study, and adding an additional 1% growth rate from 2019 to design year 2025, the above traffic safety mitigation measures will be effective in making this section of Barracks Road safer. The use transition for this collector road from its current state to a school zone has already been established by the County with the approval of the Field School of Charlottesville. 2 TURN LEES ANALYSIS Traffic Impact Analysis Report for Faster Forge Farm School mere'i:asx of rheaWems- zr:t,d— eaannnna w the Ym I.Iaghr wml mere'i: ssx or the.warm=sa n.de weamnna m the.i IN (I. wm) Existing Traffic Data Gms factor= l.OM per year, and AADT 2019=MDO VPD Using this equation, the estimated AADT at 2025= 76K VPD CAGA=1v 1 —1 6u� bWTb1R BamaaPa in.1 ]N3 WO PeekMwr5R 65CTraMe e.amnm A. .,ewnnna ha4 Nour.A366'bWT 738 IWH mM29-2022 Site Traffic Generation Data Pk Xou.N TraM• ne lx9aounlurr roltir mNeMeanelxr uml ne lkr vnl PMPUYNow SM1TrNfi• .w.a 1•baaegerrenrc .e•uveralknTnmlwrzxrc .•wv.a 1•bavnl emxs.�ew3 AeaaeN Ten. P• -.e wesnXrtnx,rc m22m 1 pease Tx"--.. Ww ATV.l a rc• reav rmse raw saw newrcav Pave ro,2 Fight Turn lane Assessment M 6Wen� mr none Xgmary AM llil"slhT�11 503 YA -AM Peak Mo SA6 TraRe Atxuntl+AM Neklaur M,Talfieeas[buntl anterh%) V Ripui 9 Wi =AM Peak Hour Sile Toltec ea91-untl anh,inj PM N] =PM Pert Xwr 5R. n.-Aix d+ PM Nek Xour 6Ae Talfie-exetl(entermn VRipui 1 Wi =PM Pea4Xwr AeTalRu eas[Muntl(eMeriry)120 FIGURE 3-26 WARRANTS FOR RIGHT TURN TREATMENT (2-LANE HIGHWAY) Appropnata Ratllus rapuna. at all ln[ar¢acllons antl Entrances (Commercial or PnVate). Lek Turn lane Assessment AN YA Va ADVANCING VOLUME (VPM) FIGURE 3-10 WARRANT FOR LEFT TURN STORAGE LANES ON TWO LANE HIGHWAY Nothing required. AM Peak= 5R 04 UAir ea rrd al A Xour SileTalfiee tu.nsl aneriryl AM Peak l4rur AeTaXlewes[Wuntl entai') AM Peak l4rur 5R 04 UA it wenbountl ♦ AM Rek Xour 6ile7alfie WHMurtl (entering( • IeRTun Volure/ AMartirg Volume PMPea4 Xwr5R65CTraflic-Abu ntl+PMPukla-AeTalfi—e tues!(mtermg) •PM Pea4Xwr AeTa)Re we wAst ann,iry) PM Peak Xwr 5R 65 nr sPAtx,ntl i PM Nek Xour 6Xe7alfie wH Ursl(entering( •IeRTun Volurw/AMarcirg Volume i Vn ADVANCING VOLUME (VPN) FIGURE 3-10 WARRANT FOR LEFT TURN STORAGE LANES ON TWO LANE HIGHWAY Te.MAro elrelsr..s,.,Y .2.1 MMnM1 TnP6wwramnumaTwn Lew maryaX la raur rnrge I.— srma A,An Ass RE112 Appendix A Land Use 522 Middle School/Junior High School Description Amiddle or junior high school serves students who have completed elementary school and have not yet entered high school. Both public and private middle schools/junior high schools are included in this land use. Elementary school (Land Use 520), high school (Land Use 530), private school (K-8) (Land Use 534), private school (K-12) (Land Use 536), and charter elementary school (Land Use 537) are related uses. Additional Data The percentage of students at the sites who were transported to school via bus varied considerably. Due to the varied transit and school bus usage at these sites, it is desirable that future studies include additional detail on the percentage of students who were bused to school and the percentage that were dropped off and picked up. Because the ratio of floor space to student population varies widely among the schools surveyed, the number of students may be a more reliable independent variable on which to establish trip generation rates. Time -of -day distribution data for this land use are presented in Appendix A. For the two general urban/suburban sites with data, the overall highest vehicle volumes during the AM and PM on a weekday were counted between 7:00 and 8:00 a.m. and 5:00 and 6:00 p.m., respectively. The sites were surveyed in the 1990s, the 2000s, and the 2010s in California, Connecticut, Delaware, Florida, Minnesota, Nebraska, Oregon, Pennsylvania, and Tennessee. Source Numbers 431, 444, 534, 536, 564, 579, 592, 611, 719, 867, 936, 940 26 Trip Generation Manual 10th Edition • Volume 2: Data • Institutional (Land Uses 500-599) it Middle School/Junior High School Vehicle Trip Ends vs: Students On a: Weekday Setting/Location: General Urban/Suburban Number of Studies: 10 Avg. Num. of Students: 1079 Directional Distribution: 50% entering, 50% exiting Vehicle Trip Generation per Student Average Rate Range of Rates Standard Deviation 2.13 1.48 - 2.81 0.46 Data Plot and Equation 4,000 -'X 3,000 X X X w X a H 2,000 X X X 1,000 X 00 500 1,000 1,500 X = Number of Students X Study Site Fitted Curve - - - - Average Rate Fitted Curve Equation: Ln(T) = 0.79 Ln(X) + 2.21 R'= 0.73 K Trip Generation Manual 10th Edition - Volume 2: Data o Institutional (Land Uses 500-599) 27 Middle School/Junior High School Vehicle Trip Ends vs: Students On a: Weekday, Peak Hour of Adjacent Street Traffic, One Hour Between 7 and 9 a.m. Setting/Location: General Urban/Suburban Number of Studies: 22 Avg. Num. of Students: 937 Directional Distribution: 54% entering, 46% exiting Vehicle Trip Generation per Student Average Rate Range of Rates Standard Deviation 0.58 0.06 - 1.29 0.32 Data Plot and Equation 1,200 X 1,000 X X, X 800 X X N C X o X X X 600 X X xC X 400 X X XX 200 X X X 00 500 1,000 1,500 X = Number of Students X Study Site - - - - Average Rate Fitted Curve Equation: Not Given W=.- 28 Trip Generation Manual 10th Edition • Volume 2: Data • Institutional (Land Uses 500-599) K Middle School/Junior High School Vehicle Trip Ends vs: Students On a: Weekday, Peak Hour of Adjacent Street Traffic, One Hour Between 4 and 6 p.m. Setting/Location: General Urban/Suburban Number of Studies: 21 Avg. Num. of Students: 1023 Directional Distribution: 49% entering, 51 % exiting Vehicle Trip Generation per Student Average Rate Range of Rates Standard Deviation 0.17 0.06 - 0.51 0.12 Data Plot and Equation 800 X 600 a w a H` H 400 X X 200 X X ,_-� X xX X X X X X X 0 0 500 1,000 1.500 X = Number of Students X Study Site - - - - Average Rate Fitted Curve Equation: Not Given W= **** K Trip Generation Manual 10th Edition * Volume 2: Data * Institutional (Land Uses 500-599) 29