GREENLIGHT
ENGINEERI NG
T RAF F I C ENGI NEERI NG/ TRANSPOR TATI ON P LANNI NG
May 8, 2017 West Linn City Council 22500 Salamo Road West Linn, OR 97068 RE: City of West Linn FILE NO. SUB-15-03, WAP-16-03 Greenlight Engineering has been asked by our client, Jason Harra, to evaluate the transportation related impacts of the proposed 34 lot subdivision proposed at 18000 Upper Midhill Drive in West Linn, Oregon. We have completed a review of the application materials and have visited the site. We offer the following comments. Executive Summary The application fails to provide the necessary evidence to support approval of the project for the following reasons: • • • •
Highway 43/Arbor Drive interim mitigation is not an improvement for bicyclists, pedestrians, and transit and disabled users The traffic impact analysis (TIA) fails to account for the cumulative impacts of approved development in the area The TIA's assumed growth rate of 1% per year is not based on evidence The TIA fails to provide the raw traffic count data of October 2016 traffic counts
Highway 43/Arbor Drive Interim Mitigation is Not an Improvement for Bicyclists, Pedestrians, and Transit and Disabled Users The proposed interim improvements at the Highway 43/Arbor Drive intersection are detailed on Figure 9 of Kittelson and Associate's March 1, 2017 letter. The improvements consist of restriping the existing pavement at and around the intersection to allow for the construction of a northbound and southbound two way left turn lane to better accommodate automobile mobility and safety. Unfortunately, the improvements provide benefits only to automobile mobility and safety, but are a detriment to pedestrian, bicycle, transit and disabled user safety. There has been no discussion or analysis of impacts to these users by the applicant. There are currently bike lanes on Highway 43 near Arbor Drive with no separate pedestrian facilities. These bicycle facilities are shared by pedestrians, cyclists and transit users. There are bus stops located on the northwest and southeast corners of the intersection. The interim improvement proposal suggests the restriping of bicycle
13554 Rogers Road ● Lake Oswego, OR 97035 Phone: 503.317.4559 ● Web: www.greenlightengineering.com
facilities to 5 ½ feet wide in some locations, significantly narrowing the existing width in several locations to a width below ODOT standard. According to the ODOT Highway Design Manual, the minimum bike lane width along Highway 43 is six feet wide. On the southeast corner of the intersection, at the location of a Tri-Met bus stop, pedestrians, bikes and transit users will all share a space just 5 ½ feet if the proposed improvement is constructed. The Department of Transportation ADA Standards for Transportation Facilities (2006) requires an eight foot by five foot area in location of bus boarding or alighting as shown below in Figure 810.2.2 from ADA1. These dimensions currently exist at the location of the two bus stops, but would not exist near the location of the southeast corner bus stop if the interim improvements are constructed. ADA 810.2.2 states “Bus stop boarding and alighting areas shall provide a clear length of 96 inches (2440 mm) minimum, measured perpendicular to the curb or vehicle roadway edge, and a clear width of 60 inches (1525 mm) minimum, measured parallel to the vehicle roadway.”
Figure 810.2.2 Dimensions of Bus Boarding and Alighting Areas
In addition to the lack of area to continue to meet ADA requirements, pedestrians, cyclists, transit users will all need to share a much more narrow space than currently exists and which does not meet standard in order to accommodate the impacts of this proposed development. As there is no identified funding for the ultimate Highway 43 improvement, this situation could exist for many years if the interim improvements are approved for construction. In their March 1, 2017 letter, Kittelson argues that “[p]edestrians and bicyclists wanting to access OR 43 will be able to continue to use the College Hill Place-Marylcreek Drive connection to the OR 43/Marylbrook Drive intersection, which is served by local transit service”. While that connection does exist, it is wholly inconvenient for most of the existing neighborhood that utilizes the Highway 43/Arbor intersection for pedestrian, 1
https://www.access-board.gov/guidelines-and-standards/buildings-and-sites/about-the-adastandards/ada-standards/chapter-8-special-rooms,-spaces,-and-elements#810%20Transportation %20Facilities
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bicycle and transit access. This connection is unlikely to be utilized by those destined to the south on Highway 43 or by those that would need to travel out of direction to use this connection nor does it provide any benefit to bicyclists traveling south on Highway 43 as they would still need to travel via the narrowed bike lane on Highway 43. Section 85.170(B)(2)(e)(1)(C) of the West Linn Community Development Code requires that “[w]hen a Traffic Impact Analysis is required, approval of the development proposal requires satisfaction of the following criteria: The proposed site design and traffic and circulation design and facilities, for all transportation modes, including any mitigation measures, are designed to: (1) Have the least negative impact on all applicable transportation facilities; and (2) Accommodate and encourage non-motor vehicular modes of transportation to the extent practicable; and (3) Make the most efficient use of land and public facilities as practicable; and (4) Provide the most direct, safe and convenient routes practicable between on-site destinations, and between on-site and off-site destinations; and (5) Otherwise comply with applicable requirements of the City of West Linn Community Development Code” The application fails to provide any evaluation of items 1-4 with regard to the impacts of the proposed mitigation at Highway 43/Arbor Drive. The TIA Fails to Account for Background Traffic The TIA fails to account for the impacts of several developments in the nearby area that have been approved but are not yet constructed. CDC 02.030 requires “[t]o be adequate, on-site and adjacent facilities must meet City standards, and off-site facilities must have sufficient capacity to (1) meet all existing demands, (2) satisfy the projected demands from projects with existing land use approvals, plus the additional demand created by the application, and (3) remain compliant with all applicable standards” (emphasis added). Nearby projects that would have an impact on the study intersections include:
Mary's Woods expansion located at Marylhurst roughly 1/3 a mile to the north of the Highway 43/Arbor intersection Shady Hollow Village located roughly 1/4 of a mile to the south of the Highway 43/Arbor intersection
According to the November 30, 2016 traffic report prepared by Kittelson and Associates for the Mary's Woods project, the ongoing Mary's Woods expansion consists of the
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following and equates to approximately 165 weekday PM peak hour trips (see Appendix A):
48 units of assisted living or roughly 11 PM weekday peak hour trips 199 units of independent living or 50 PM peak hour trips 9,485 square foot medical office or roughly 25 PM peak hour trips 3,955 square foot pub, 9,485 square foot wellness center, 8,825 square foot office, 7,210 square foot retail, and 1,615 square foot deli or 79 weekday PM peak hour trips
According to the May 2008 traffic impact analysis prepared by Charbonneau Engineering for the Shady Hollow Village project, Shady Hollow Village could generate 27 weekday PM peak hour trips (see Appendix A). The approved development in the area will vastly exceed 31 vehicles just from these two nearby developments, not to mention other developments (i.e. Wizer block in Lake Oswego) that have been approved or regional growth that has occurred since the October 2016 traffic counts or will occur along Highway 43. Additionally, as the TIA assumes a 1% growth/year is applied equally over each of the study intersection movements, the TIA is unreliable as it does not specifically load the study intersections for approved developments appropriately. For instance, while the Highway 43/Marylhurst intersection will experience an increase in 165 weekday PM peak hour due to the Mary's Woods expansion, they are mostly turning movements into and out of the subject driveway. However, the TIA for this subdivision project generally analyzes these extra trips as through movements through the intersection rather than the turning movements that will actually occur. The TIA's Assumed Growth Rate of 1% Per Year is Not Based on Evidence On page 3 of their March 1, 2017 letter, Kittelson opines that the assumed 1% growth/year added to the existing counts at the study intersections accounts for all regional and local growth. The assumed 1% growth per year equates to “31 additional vehicles during the weekday PM peak hour.” The Kittelson reports fail to provide any information regarding where the assumed 1% growth is derived from. Greenlight Engineering commissioned Key Data Network to conduct a traffic count on Highway 43 north of Arbor Drive (see Appendix B) to collect daily traffic volumes on Highway 43. Additionally, we researched ODOT historical traffic data available in their annual Transportation Volume Tables on Highway 43 north of Arbor Drive (see Appendix C). Table 1 below illustrates the average annual daily traffic volumes on Highway 43 north of Arbor Drive over various years and associated year over year growth rates.
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Table 1. Highway 43 North of Arbor Drive Year of Count AADT 2013* 2014* 2015* 2017**
Growth (%)/Yr Notes 16900 17100 15900 20653
1.2 -7.0 14.9 29.9% growth over two years
*Source: ODOT, Transportation Volume Tables **Source: Key Data Network, May 2017 count
To adjust our May 2017 counts, the ODOT Analysis Procedures Manual was utilized (see Appendix D). The seasonal trend table method was utilized. When comparing the ODOT Transportation Volume Tables with our seasonally adjusted 2017 traffic count, it is clear that traffic volumes have greatly increased from 2015, the most recent data that ODOT has published. When comparing 2015 to 2017, the traffic volumes represent a percent growth of 14.9% per year. Even when comparing 2013 to 2017 data, the traffic volumes represent a yearly percent growth of over five percent per year, far more than Kittelson assumed. Additionally, the applicant provides no evidence that their assumed build-out year of 2018 is able to be met. The TIA Fails to Provide October 2016 Traffic Counts The March 1, 2017 Kittelson letter references traffic counts that were collected in October 2016. However, the letter fails to include evidence of the raw traffic counts nor the calculations that were utilized in seasonally adjusting the raw traffic counts as reported.
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Conclusion The land use application fails to provide substantial evidence, or in some cases any evidence at all, to support the conclusion that the applicant demonstrated compliance with the transportation related requirements necessary to approve this land use application. Should you have any questions, feel free to contact me at 503-317-4559. Sincerely,
Rick Nys, P.E. Principal Traffic Engineer
Experience and Experience I am a Professional Engineer (P.E.) registered in the State of Oregon. I hold a Bachelor of Science degree in Civil Engineering. I have over seventeen years of experience in traffic engineering and transportation planning.
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Appendix A Mary's Woods & Shady Hollow Village Trip Generation
Appendix B Highway 43 North of Arbor Drive Traffic Count, May 4, 2017
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Page 1
KEY DATA NETWORK K-D-N.com Tualatin, OR 97062 503-804-3294
Hwy 43 north of Arbor Dr Date Start: 5/3/2017 Latitude: 45' 23.7488 North Longitude: 122' 39.0669 West
Start 5/3/2017 NB SB Time Wed A.M. P.M. A.M. P.M. 12:00 * * * * 12:15 * * * * 12:30 * * * * 12:45 * * * * 01:00 * * * * 01:15 * * * * 01:30 * * * * 01:45 * * * * 02:00 * * * * 02:15 * * * * 02:30 * * * * 02:45 * * * * 03:00 * * * * 03:15 * * * * 03:30 * * * * 03:45 * * * * 04:00 * * * * 04:15 * * * * 04:30 * * * * 04:45 * * * * 05:00 * * * * 05:15 * * * * 05:30 * * * * 05:45 * * * * 252 118 06:00 * * 251 120 06:15 * * 239 112 06:30 * * 190 88 06:45 * * 07:00 * 132 * 81 07:15 * 100 * 96 07:30 * 96 * 98 07:45 * 104 * 80 08:00 * 134 * 46 08:15 * 100 * 62 08:30 * 96 * 58 08:45 * 92 * 54 09:00 * 99 * 46 09:15 * 88 * 43 09:30 * 82 * 45 09:45 * 52 * 31 10:00 * 48 * 26 10:15 * 30 * 26 10:30 * 28 * 14 10:45 * 22 * 9 11:00 * 19 * 6 11:15 * 11 * 10 11:30 * 14 * 6 11:45 * 18 * 7 Total 0 2297 0 1282 Day Total 2297 1282 % Total 0.0% 64.2% 0.0% 35.8% Peak Vol. P.H.F.
-
-
06:00 932 0.925
-
06:00 438 0.913
Combined A.M. P.M. * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 370 * 371 * 351 * 278 * * 213 * 196 * 194 * 184 * 180 * 162 * 154 * 146 * 145 * 131 * 127 * 83 * 74 * 56 * 42 * 31 * 25 * 21 * 20 * 25 0 3579 3579
-
06:00 1370 0.923
5/4/201 Thu
NB SB A.M. P.M. A.M. P.M. 15 153 6 124 4 151 6 125 4 150 4 164 2 164 7 125 10 147 2 130 6 156 2 130 7 160 4 120 3 170 2 122 3 185 1 124 4 156 2 120 3 174 2 142 2 182 1 135 147 1 292 2 221 6 274 0 282 2 261 4 211 0 251 5 2 273 6 134 1 262 8 122 293 7 18 205 273 12 22 186 265 8 37 136 282 8 47 238 20 246 78 216 12 254 93 184 34 265 111 122 33 218 170 123 258 55 166 112 273 59 139 102 272 95 128 86 284 107 130 64 94 94 258 50 110 83 246 66 124 94 219 66 107 112 214 59 132 97 242 58 102 104 246 56 114 62 183 56 109 70 198 52 116 74 157 38 144 66 168 26 109 64 133 18 116 26 141 24 124 23 156 18 138 20 136 14 120 25 114 10 143 17 125 12 134 18 158 8 148 13 148 11 2709 7282 4969 5094 9991 10063 13.5% 36.3% 24.8% 25.4%
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11:00 545 0.921
04:30 1113 0.950
06:30 1087 0.957
03:00 861 0.763
Combined A.M. P.M. 21 277 10 276 8 314 9 289 12 277 8 286 11 280 5 292 4 309 6 276 5 316 3 317 439 3 495 6 543 6 462 5 8 407 9 384 25 498 34 459 45 401 55 520 98 462 105 438 145 387 203 341 313 278 332 241 367 214 391 194 352 144 356 149 343 160 321 171 374 155 348 160 297 118 307 122 273 112 312 92 242 82 257 50 280 41 274 34 234 35 268 29 292 26 296 24 7678 12376 20054
07:00 1466 0.937
03:00 1939 0.893
Page 2
KEY DATA NETWORK K-D-N.com Tualatin, OR 97062 503-804-3294
Hwy 43 north of Arbor Dr Date Start: 5/3/2017 Latitude: 45' 23.7488 North Longitude: 122' 39.0669 West
Start 5/5/2017 NB SB Time Fri A.M. P.M. A.M. P.M. 152 12:00 12 12 134 172 134 12:15 7 4 148 141 12:30 8 4 192 119 12:45 1 5 149 01:00 9 144 4 01:15 8 137 2 124 01:30 4 1 4 0 01:45 4 1 4 1 02:00 5 * 1 * 02:15 4 * 1 * 02:30 4 * 2 * 02:45 2 * 4 * 03:00 2 * 6 * 03:15 2 * 1 * 03:30 2 * 9 * 03:45 6 * 5 * 04:00 4 * 3 * 04:15 4 * 10 * 04:30 5 * 16 * 04:45 6 * 15 * 05:00 10 * 21 * 05:15 14 * 49 * 05:30 20 * 62 * 05:45 16 * 70 * 06:00 28 * 104 * 06:15 26 * 155 * 06:30 38 * 210 * 06:45 54 * 205 * 260 07:00 72 * * 265 07:15 104 * * 239 07:30 104 * * 214 07:45 96 * * 08:00 110 * 213 * 08:15 114 * 194 * 08:30 111 * 232 * 08:45 97 * 247 * 09:00 111 * 174 * 09:15 93 * 216 * 09:30 136 * 182 * 09:45 123 * 166 * 10:00 104 * 146 * 10:15 102 * 128 * 10:30 113 * 111 * 10:45 123 * 152 * 116 11:00 * 147 * 122 11:15 * 137 * 146 11:30 * 145 * 144 11:45 * 154 * Total 2546 947 4710 802 Day Total 3493 5512 % Total 28.3% 10.5% 52.3% 8.9% Peak Vol. P.H.F. ADT
-
11:00 528 0.904
ADT 19,518
12:00 664 0.865
07:00 978 0.923
AADT 19,518
00:15 543 0.911
Combined A.M. P.M. 24 286 306 11 289 12 311 6 293 13 10 261 8 1 8 2 6 * 5 * 6 * 6 * 8 * 3 * 11 * 11 * 7 * 14 * 21 * 21 * 31 * 63 * 82 * 86 * 132 * 181 * 248 * 259 * 332 * 369 * 343 * 310 * 323 * 308 * 343 * 344 * 285 * 309 * 318 * 289 * 250 * 230 * 224 * 275 * 263 * 259 * 291 * 298 * 7256 1749 9005
07:00 1354 0.917
00:15 1199 0.964
5/6/201 Sat
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NB SB A.M. P.M. A.M. P.M. * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 0 0 0 0 0 0 0.0% 0.0% 0.0% 0.0% -
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Combined A.M. P.M. * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 0 0 0
-
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Appendix C Highway 43 ODOT Transportation Volume Tables 2013, 2014, 2015
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Appendix D May 4, 2017 Traffic Count Seasonal Adjustment
SEASONAL TREND TABLE (Updated: 9/30/16 ) TREND INTERSTATE URBANIZED INTERSTATE NONURBANIZED COMMUTER COASTAL DESTINATION COASTAL DESTINATION ROUTE AGRICULTURE RECREATIONAL SUMMER RECREATIONAL SUMMER WINTER RECREATIONAL WINTER SUMMER SUMMER < 2500
1-Jan
15-Jan
1-Feb
15-Feb
1-Mar
15-Mar
1-Apr
15-Apr
1-May
15-May
1-Jun
15-Jun
1-Jul
15-Jul
1-Aug
15-Aug
1-Sep
15-Sep
1-Oct
15-Oct
1-Nov
15-Nov
1-Dec
15-Dec
Seasonal Trend Peak Period Factor
1.0328 1.2437 1.0475 1.2011 1.4581 1.2501 1.7175 1.1876 0.9829 1.2064 1.2956
1.0423 1.3089 1.0553 1.2105 1.4945 1.2671 1.7853 1.2510 0.9405 1.2361 1.3295
1.0157 1.2543 1.0272 1.1669 1.4132 1.2126 1.7144 1.2671 0.9610 1.1933 1.2823
0.9891 1.1997 0.9991 1.1234 1.3319 1.1581 1.6434 1.2831 0.9814 1.1505 1.2352
0.9780 1.1341 0.9913 1.0959 1.2689 1.1239 1.5416 1.3092 1.0088 1.1163 1.1775
0.9670 1.0685 0.9836 1.0684 1.2060 1.0896 1.4398 1.3353 1.0363 1.0821 1.1198
0.9582 1.0594 0.9655 1.0679 1.1989 1.0515 1.3847 1.4523 1.2717 1.0551 1.0711
0.9493 1.0503 0.9474 1.0673 1.1918 1.0134 1.3297 1.5692 1.5070 1.0280 1.0223
0.9530 1.0243 0.9442 1.0450 1.1318 0.9750 1.1730 1.5280 1.8899 0.9946 0.9728
0.9567 0.9984 0.9411 1.0227 1.0718 0.9367 1.0163 1.4868 2.2729 0.9611 0.9232
0.9385 0.9494 0.9497 0.9832 1.0090 0.9081 0.9355 1.2809 1.9598 0.9252 0.8909
0.9202 0.9005 0.9583 0.9438 0.9462 0.8794 0.8546 1.0750 1.6468 0.8893 0.8586
0.9228 0.8748 0.9410 0.8923 0.8627 0.8633 0.7960 0.9651 1.4478 0.8654 0.8394
0.9275 0.8449 0.9243 0.8293 0.7570 0.8439 0.7248 0.8183 1.1378 0.8356 0.8161
0.9229 0.8450 0.9206 0.8289 0.7580 0.8440 0.7363 0.8556 1.1680 0.8394 0.8251
0.9182 0.8452 0.9168 0.8284 0.7589 0.8441 0.7478 0.8930 1.1981 0.8431 0.8341
0.9363 0.8928 0.9289 0.8792 0.8357 0.8457 0.8050 1.0372 1.3341 0.8787 0.8478
0.9544 0.9405 0.9409 0.9300 0.9125 0.8473 0.8623 1.1814 1.4702 0.9142 0.8616
0.9568 0.9815 0.9431 0.9866 1.0223 0.8799 0.9661 1.4146 1.7772 0.9489 0.9004
0.9592 1.0224 0.9452 1.0432 1.1321 0.9125 1.0699 1.6262 2.0843 0.9836 0.9392
0.9776 1.0445 0.9734 1.1000 1.2122 0.9820 1.2299 1.6922 2.4169 1.0386 1.0145
0.9959 1.0666 1.0017 1.1567 1.2922 1.0515 1.3898 1.7365 2.7495 1.0936 1.0898
1.0131 1.1193 1.0249 1.1795 1.3556 1.1491 1.5122 1.4069 1.8778 1.1381 1.1787
1.0303 1.1721 1.0481 1.2023 1.4189 1.2467 1.6346 1.0773 1.0060 1.1826 1.2675
0.9182 0.8449 0.9168 0.8284 0.7570 0.8439 0.7248 0.8183 0.9405 0.8356 0.8161
*Seasonal Trend Table factors are based on previous year ATR data. The table is updated yearly. *Grey shading indicates months were seasonal factor is greater than 30% Highway 43 North of Arbor Drive 20054 Count collected on May 3, 2017 1.029886562 Seasonal Factor based on Commuter route 20653 AADT
