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CC - Traffic Impact Study Phasing Analysis Addendum 031616
Six Mile Engineering, PA Phone: (208) 378-0654 704 E. United Heritage Court, Suite 204 Fax: (208) 378-0598 Meridian, ID 83642 March 16, 2016 Ms. Becky McKay Engineering Solutions 1029 N. Rosario Street, Suite 100 Meridian, ID 83642 Subject: Phasing Analysis and South Connection to Amity Road Brundage Estates Subdivision Dear Becky: As requested by ACHD, this letter summarizes the phasing analysis conducted for the Brundage Estates Subdivision to estimate the single-family dwelling unit threshold that trigger signalization or roundabout improvements at the Victory Road and Linder Road intersection and the Harris Street and Meridian Road intersection. Background, off-site and site traffic data used for the phasing analysis are taken from the traffic impact study report for Brundage Estates Subdivision dated February 2, 2016. The TIS divided the development into two phases – Phase 1 with 183 dwelling units by 2020 and Phase 2 with 183 dwelling units and an 8.24-acre City Park by 2024 (total of 366 dwelling units). For this phasing analysis, the City Park trips and captured trips were equally distributed over four years between 2020 and 2024. This analysis assumes that the Brundage Estates Subdivision does not have connectivity to the east via Harris Street. We also evaluated how an additional southern connection to Amity Road (without the Harris Street extension) would impact the dwelling unit threshold and timing of intersection improvements. Victory Road and Linder Road Intersection (future signal or roundabout) The maximum number of dwelling units that can be constructed before the Victory and Linder Road intersection is projected to exceed ACHD’s minimum operational thresholds is 290 dwelling units (79 percent of full build-out), which is all of Phase 1 and a portion of Phase 2. This is anticipated to occur by 2022. The additional southern connection to Amity Road is not expected to change the site, off-site or background traffic patterns to a significant degree that it would delay the need for signalization or roundabout improvements at the Victory Road and Linder Road intersection. Harris Street and Meridian Road Intersection (future signal) The Harris Street and Meridian Road intersection is projected to exceed ACHD’s minimum operational thresholds with 2020 background traffic and will require signalization. Ms. Becky McKay March 16, 2016 Page 2 Six Mile Engineering, PA Phone: (208) 378-0654 704 E. United Heritage Court, Suite 204 Fax: (208) 378-0598 Meridian, ID 83642 The additional southern connection to Amity Road is expected to reduce some background traffic at the Harris Street and Meridian Road intersection. However, this traffic reduction is not sufficient to change the timing of the warranted signalization improvements at Harris Street and Meridian Road intersection. Thank you for the opportunity to provide our services. Sincerely, Leah G. Kelsey, P.E. Chhang Ream, P.E., PTOE Attachments: Synchro Output Signal Warrant Worksheets HCM 2010 AWSC 2022 Site + Background (290 DU) 1: Linder Road & Victory Road AM Peak Six Mile Engineering, PA Brundage Estates Subdivision March 2016 Meridian, Idaho Intersection Intersection Delay, s/veh 33.8 Intersection LOS D Movement EBU EBL EBT EBR WBU WBL WBT WBR NBU NBL NBT NBR SBU SBL SBT SBR Traffic Vol, veh/h 0 42 433 28 0 60 120 6 0 73 187 149 0 11 22 5 Future Vol, veh/h 0 42 433 28 0 60 120 6 0 73 187 149 0 11 22 5 Peak Hour Factor 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 Heavy Vehicles, % 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 Mvmt Flow 0 47 481 31 0 67 133 7 0 81 208 166 0 12 24 6 Number of Lanes 0 0 1 0 0 0 1 0 0 0 1 0 0 0 1 0 Approach EB WB NB SB Opposing Approach WB EB SB NB Opposing Lanes 1 1 1 1 Conflicting Approach Left SB NB EB WB Conflicting Lanes Left 1 1 1 1 Conflicting Approach Right NB SB WB EB Conflicting Lanes Right 1 1 1 1 HCM Control Delay 47.3 14.1 28.1 11.4 HCM LOS E B D B Lane NBLn1 EBLn1 WBLn1 SBLn1 Vol Left, % 18% 8% 32% 29% Vol Thru, % 46% 86% 65% 58% Vol Right, % 36% 6% 3% 13% Sign Control Stop Stop Stop Stop Traffic Vol by Lane 409 503 186 38 LT Vol 73 42 60 11 Through Vol 187 433 120 22 RT Vol 149 28 6 5 Lane Flow Rate 454 559 207 42 Geometry Grp 1 1 1 1 Degree of Util (X) 0.783 0.936 0.389 0.089 Departure Headway (Hd) 6.2 6.028 6.775 7.548 Convergence, Y/N Yes Yes Yes Yes Cap 582 598 529 472 Service Time 4.25 4.077 4.841 5.637 HCM Lane V/C Ratio 0.78 0.935 0.391 0.089 HCM Control Delay 28.1 47.3 14.1 11.4 HCM Lane LOS D E B B HCM 95th-tile Q 7.4 12.2 1.8 0.3 HCM 2010 AWSC 2022 Site + Background (290 DU) 1: Linder Road & Victory Road PM Peak Six Mile Engineering, PA Brundage Estates Subdivision March 2016 Meridian, Idaho Intersection Intersection Delay, s/veh 34.2 Intersection LOS D Movement EBU EBL EBT EBR WBU WBL WBT WBR NBU NBL NBT NBR SBU SBL SBT SBR Traffic Vol, veh/h 0 9 195 59 0 175 350 11 0 51 63 102 0 14 127 17 Future Vol, veh/h 0 9 195 59 0 175 350 11 0 51 63 102 0 14 127 17 Peak Hour Factor 0.92 0.92 0.92 0.92 0.92 0.92 0.92 0.92 0.92 0.92 0.92 0.92 0.92 0.92 0.92 0.92 Heavy Vehicles, % 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 Mvmt Flow 0 10 212 64 0 190 380 12 0 55 68 111 0 15 138 18 Number of Lanes 0 0 1 0 0 0 1 0 0 0 1 0 0 0 1 0 Approach EB WB NB SB Opposing Approach WB EB SB NB Opposing Lanes 1 1 1 1 Conflicting Approach Left SB NB EB WB Conflicting Lanes Left 1 1 1 1 Conflicting Approach Right NB SB WB EB Conflicting Lanes Right 1 1 1 1 HCM Control Delay 16.2 56.5 15.4 14.2 HCM LOS C F C B Lane NBLn1 EBLn1 WBLn1 SBLn1 Vol Left, % 24% 3% 33% 9% Vol Thru, % 29% 74% 65% 80% Vol Right, % 47% 22% 2% 11% Sign Control Stop Stop Stop Stop Traffic Vol by Lane 216 263 536 158 LT Vol 51 9 175 14 Through Vol 63 195 350 127 RT Vol 102 59 11 17 Lane Flow Rate 235 286 583 172 Geometry Grp 1 1 1 1 Degree of Util (X) 0.447 0.513 0.979 0.346 Departure Headway (Hd) 6.861 6.466 6.052 7.246 Convergence, Y/N Yes Yes Yes Yes Cap 521 555 600 493 Service Time 4.949 4.55 4.117 5.343 HCM Lane V/C Ratio 0.451 0.515 0.972 0.349 HCM Control Delay 15.4 16.2 56.5 14.2 HCM Lane LOS C C F B HCM 95th-tile Q 2.3 2.9 13.9 1.5 HCM 2010 TWSC 2020 Background with South Connection to Amity Rd 4: Meridian Road & Harris Street AM Peak Six Mile Engineering, PA Brundage Estates Subdivision March 2016 Meridian, Idaho Intersection Int Delay, s/veh 3 Movement EBL EBT EBR WBL WBT WBR NBL NBT NBR SBL SBT SBR Traffic Vol, veh/h 108 0 8 2 0 47 2 1517 2 31 442 32 Future Vol, veh/h 108 0 8 2 0 47 2 1517 2 31 442 32 Conflicting Peds, #/hr 0 0 0 0 0 0 0 0 0 0 0 0 Sign Control Stop Stop Stop Stop Stop Stop Free Free Free Free Free Free RT Channelized - - None - - None - - None - - None Storage Length - - - - - - 50 - - 50 - 500 Veh in Median Storage, # - 2 - - 2 - - 0 - - 0 - Grade, % - 0 - - 0 - - 0 - - 0 - Peak Hour Factor 90 90 90 90 90 90 90 90 90 90 90 90 Heavy Vehicles, % 2 2 2 2 2 2 2 2 2 2 2 2 Mvmt Flow 120 0 9 2 0 52 2 1686 2 34 491 36 Major/Minor Minor2 Minor1 Major1 Major2 Conflicting Flow All 1407 2252 246 2005 2251 844 491 0 0 1688 0 0 Stage 1 560 560 - 1691 1691 - - - - - - - Stage 2 847 1692 - 314 560 - - - - - - - Critical Hdwy 7.54 6.54 6.94 7.54 6.54 6.94 4.14 - - 4.14 - - Critical Hdwy Stg 1 6.54 5.54 - 6.54 5.54 - - - - - - - Critical Hdwy Stg 2 6.54 5.54 - 6.54 5.54 - - - - - - - Follow-up Hdwy 3.52 4.02 3.32 3.52 4.02 3.32 2.22 - - 2.22 - - Pot Cap-1 Maneuver ~ 99 41 754 35 41 307 1069 - - 375 - - Stage 1 480 509 - 97 148 - - - - - - - Stage 2 323 147 - 671 509 - - - - - - - Platoon blocked, %- - - - Mov Cap-1 Maneuver ~ 76 37 754 32 37 307 1069 - - 375 - - Mov Cap-2 Maneuver 207 105 - 91 135 - - - - - - - Stage 1 479 463 - 97 148 - - - - - - - Stage 2 268 147 - 603 463 - - - - - - - Approach EB WB NB SB HCM Control Delay, s 42.9 20.9 0 1 HCM LOS E C Minor Lane/Major Mvmt NBL NBT NBR EBLn1WBLn1 SBL SBT SBR Capacity (veh/h) 1069 - - 218 280 375 - - HCM Lane V/C Ratio 0.002 - - 0.591 0.194 0.092 - - HCM Control Delay (s) 8.4 - - 42.9 20.9 15.6 - - HCM Lane LOS A - - E C C - - HCM 95th %tile Q(veh) 0 - - 3.3 0.7 0.3 - - Notes ~: Volume exceeds capacity $: Delay exceeds 300s +: Computation Not Defined *: All major volume in platoon HCM 2010 TWSC 2020 Background with South Connection to Amity Rd 4: Meridian Road & Harris Street PM Peak Six Mile Engineering, PA Brundage Estates Subdivision March 2016 Meridian, Idaho Intersection Int Delay, s/veh 3.6 Movement EBL EBT EBR WBL WBT WBR NBL NBT NBR SBL SBT SBR Traffic Vol, veh/h 73 0 6 2 0 33 8 702 3 49 1435 109 Future Vol, veh/h 73 0 6 2 0 33 8 702 3 49 1435 109 Conflicting Peds, #/hr 0 0 0 0 0 0 0 0 0 0 0 0 Sign Control Stop Stop Stop Stop Stop Stop Free Free Free Free Free Free RT Channelized - - None - - None - - None - - None Storage Length - - - - - - 50 - - 50 - 500 Veh in Median Storage, # - 2 - - 2 - - 0 - - 0 - Grade, % - 0 - - 0 - - 0 - - 0 - Peak Hour Factor 97 97 97 97 97 97 97 97 97 97 97 97 Heavy Vehicles, % 2 2 2 2 2 2 2 2 2 2 2 2 Mvmt Flow 75 0 6 2 0 34 8 724 3 51 1479 112 Major/Minor Minor2 Minor1 Major1 Major2 Conflicting Flow All 1958 2323 740 1583 2322 363 1479 0 0 727 0 0 Stage 1 1580 1580 - 742 742 - - - - - - - Stage 2 378 743 - 841 1580 - - - - - - - Critical Hdwy 7.54 6.54 6.94 7.54 6.54 6.94 4.14 - - 4.14 - - Critical Hdwy Stg 1 6.54 5.54 - 6.54 5.54 - - - - - - - Critical Hdwy Stg 2 6.54 5.54 - 6.54 5.54 - - - - - - - Follow-up Hdwy 3.52 4.02 3.32 3.52 4.02 3.32 2.22 - - 2.22 - - Pot Cap-1 Maneuver ~ 38 37 359 73 37 634 451 - - 872 - - Stage 1 114 168 - 374 420 - - - - - - - Stage 2 616 420 - 326 168 - - - - - - - Platoon blocked, %- - - - Mov Cap-1 Maneuver ~ 34 34 359 68 34 634 451 - - 872 - - Mov Cap-2 Maneuver 105 139 - 226 135 - - - - - - - Stage 1 112 158 - 367 413 - - - - - - - Stage 2 573 413 - 302 158 - - - - - - - Approach EB WB NB SB HCM Control Delay, s 97.1 11.7 0.1 0.3 HCM LOS F B Minor Lane/Major Mvmt NBL NBT NBR EBLn1WBLn1 SBL SBT SBR Capacity (veh/h) 451 - - 111 575 872 - - HCM Lane V/C Ratio 0.018 - - 0.734 0.063 0.058 - - HCM Control Delay (s) 13.1 - - 97.1 11.7 9.4 - - HCM Lane LOS B - - F B A - - HCM 95th %tile Q(veh) 0.1 - - 4 0.2 0.2 - - Notes ~: Volume exceeds capacity $: Delay exceeds 300s +: Computation Not Defined *: All major volume in platoon Meridian Road and Harris Street Intersection (With southern connection to Amity Road) 2014 Existing Hourly Volumes and Percentages Hour Total Hourly Volume Hourly % EB Hourly Volume Hourly % 12:00 AM 79 0.6% 1 0.6% 1:00 AM 44 0.3% 1 0.6% 2:00 AM 46 0.3% 0 0.0% 3:00 AM 55 0.4% 1 0.6% 4:00 AM 114 0.8% 4 2.5% 5:00 AM 319 2.2% 3 1.9% 6:00 AM 734 5.1% 9 5.6% 7:00 AM 1,108 7.8% 19 11.7% 8:00 AM 793 5.6% 16 9.9% 9:00 AM 666 4.7% 15 9.3% 10:00 AM 651 4.6% 8 4.9% 11:00 AM 718 5.0% 8 4.9% 12:00 PM 757 5.3% 7 4.3% 1:00 PM 781 5.5% 9 5.6% 2:00 PM 840 5.9% 9 5.6% 3:00 PM 1,004 7.0% 10 6.2% 4:00 PM 1,157 8.1% 19 11.7% 5:00 PM 1,280 9.0% 9 5.6% 6:00 PM 1,021 7.1% 8 4.9% 7:00 PM 691 4.8% 1 0.6% 8:00 PM 569 4.0% 0 0.0% 9:00 PM 432 3.0% 4 2.5% 10:00 PM 264 1.8% 1 0.6% 11:00 PM 157 1.1% 0 0.0% 14,278 100% 162 100% Meridian Road Harris Street TRAFFIC SIGNAL WARRANT ANALYSIS 2020 (Phase 1) Background Traffic Warrant 1, Eight-Hour Vehicular Volume (Not Satisfied) Hour Meridian Road (Major Total) Harris Street (EB Minor) 12:00 AM 142 7 1:00 AM 79 7 2:00 AM 83 0 3:00 AM 98 7 4:00 AM 203 27 5:00 AM 571 20 6:00 AM 1,312 60 7:00 AM 1,982 126 8:00 AM 1,419 106 9:00 AM 1,192 99 10:00 AM 1,164 53 11:00 AM 1,284 53 12:00 PM 1,354 46 1:00 PM 1,397 60 2:00 PM 1,503 60 3:00 PM 1,795 66 4:00 PM 2,070 126 5:00 PM 2,290 60 6:00 PM 1,825 53 7:00 PM 1,236 7 8:00 PM 1,017 0 9:00 PM 772 27 10:00 PM 472 7 11:00 PM 281 0 25,540 1,073 Not Satisfied Not Satisfied Not Satisfied Not Satisfied Not Satisfied Not Satisfied Not Satisfied Not Satisfied Not Satisfied Not Satisfied Not Satisfied Not Satisfied Not Satisfied Satisfied Not Satisfied Not Satisfied Not Satisfied Not Satisfied Not Satisfied Not Satisfied Not Satisfied Not Satisfied Not Satisfied Not Satisfied Not Satisfied Not Satisfied Not Satisfied Not Satisfied Not Satisfied Satisfied Not Satisfied Satisfied Not Satisfied Not Satisfied Not Satisfied Satisfied Not Satisfied Not Satisfied Not Satisfied Not Satisfied Not Satisfied Not Satisfied Not Satisfied Not Satisfied Not Satisfied Not Satisfied Not Satisfied Not Satisfied Condition A Minimum Vehicular Volume @ 70% Condition B Interruption of Continuous Traffic @ 70% 2020 (Phase 1) Background Traffic Warrant 2, Four-Hour Vehicular Volume (Satisfied) 0 100 200 300 400 0 500 1000 1500 2000 2500 3000 MI N O R S T R E E T H I G H E R V O L U M E A P P R O A C H ( V P H ) MAJOR STREET - TOTAL OF BOTH APPROACHES VEHICLES PER HOUR (VPH) Figure 4C-2, Warrant 2, Four-Hour Vehicular Volume (70% Factor) (Community Less Than 10,000 Population or Above 40 mph on Major Street) 2 ORMORE LANES & 2 LANE SATISFIED NOT SATISFIED