Guidelines for the Application of Crossing Solutions at Roundabouts and Channelized Turn Lanes for Pedestrians with Vision Disabilities (2016) / Chapter Skim
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From page 277... ...
NCHRP 3-78b: Final Project Report April 2016 13 APPENDIX F: DETAILED FIELD STUDY RESULTS 277
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NCHRP 3-78b: Final Project Report April 2016 This page intentially left blanks 278
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Guidelines for the Application of Crossing Solutions at Roundabouts and Channelized Turn Lanes for Pedestrians with Vision Disabilities NCHRP 3‐78b SITE SUMMARIES – NCHRP 03‐78B – APPENDIX F 279
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280 CTL - Tucson, Arizona – Grant and Oracle Road (NE approach) Studied April 2014 Factor Rating Description Noise OK Low volume in turn lane, few trucks, no other sound sources Visibility Concerning Issue because of cabinets, and because crosswalk is too close to downstream end Lane Utilization n/a n/a because approach is single lane Exhibit 1: Traffic Volumes Exhibit 2: Special Feature Raised Crosswalk SW Quadrant Site Background This site was studied as part of trip evaluating four different channelized turn lanes in Tucson, AZ.
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From page 281... ...
281 CTL - Tucson, Arizona – Grant and Oracle Road (NE approach) Studied April 2014 Exhibit 3: O&M Estimated Intervention and Risky Events O&M and Observer Interventions O&M Estimated Interventions O&M Estimated Risky Events Count Rate Count Rate Tucson, AZ NE n=36 0 0% 2 5.56% Exhibit 4: Delay Values Average Delay (sec.)
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CTL - Tucson, Arizona – Grant and Oracle Road (SW approach) Studied April 2014 Factor Rating Description Noise OK However, yield utilization suggests an issue Visibility OK Better than NE approach; two-stage movement Lane Utilization n/a n/a because approach is single lane Exhibit 1: Traffic Volumes Exhibit 2: Special Feature Raised Crosswalk SW Quadrant 282 Site Background This site was studied as part of trip evaluating four different channelized turn lanes in Tucson, AZ.
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From page 283... ...
283 CTL - Tucson, Arizona – Grant and Oracle Road (SW approach) Studied April 2014 Exhibit 3: O&M Estimated Intervention and Risky Events O&M and Observer Interventions O&M Estimated Interventions O&M Estimated Risky Events Count Rate Count Rate Tucson, AZ SW n=45 1 2.17% 4 8.7% Exhibit 4: Delay Values Average Delay (sec.)
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From page 284... ...
284 CTL - Tucson, Arizona – Sabino Canyon Road and Tanque Verde Road Studied April 2014 Factor Rating Description Noise OK Easier to hear than Oracle & Grant, bigger island seemed helpful despite high traffic Visibility OK Lane Utilization n/a n/a because approach is single lane December 10 – 14, 2014 Exhibit 1: Traffic Volume Exhibit 2: Special Feature Site Background This site was studied as part of trip evaluating four different channelized turn lanes in Tucson, AZ. The studied CTLs featured a deceleration lane and an acceleration lanes.
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From page 285... ...
285 CTL - Tucson, Arizona – Sabino Canyon Road and Tanque Verde Studied April 2014 Exhibit 3: O&M Estimated Intervention and Risky Events O&M and Observer Interventions O&M Estimated Interventions O&M Estimated Risky Events Count Rate Count Rate Tucson, AZ NE n=37 0 0% 3 8.11% Exhibit 4: Delay Values Average Delay (sec.) Count Ave.
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From page 286... ...
286 CTL - Tucson, Arizona – Wilmot Road and Speedway Boulevard Studied April 2014 Exhibit 1: Traffic Volume Factor Rating Description Noise OK Visibility OK Lane Utilization n/a Exhibit 2: Special Feature Site Background This site was studied as part of trip evaluating four different channelized turn lanes in Tucson, AZ. The studied CTLs featured a deceleration lane but no acceleration lanes.
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From page 287... ...
287 CTL - Tucson, Arizona – Wilmot Road and Speedway Boulevard Studied April 2014 Exhibit 3: O&M Estimated Intervention and Risky Events O&M and Observer Interventions O&M Estimated Interventions O&M Estimated Risky Events Count Rate Count Rate Tucson, AZ NW n=46 1 2.17% 1 2.17% Exhibit 4: Delay Values Average Delay (sec.) Count Ave.
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From page 288... ...
288 CTL - Boulder, Colorado – 28th Street and Canyon Boulevard Studied July 2014 Exhibit 1: Traffic Volume Exhibit 2: Special Feature Factor Rating Description Noise OK Doesn't seem louder than other CTLs within Boulder Visibility Concerning Crosswalk close to downstream end creating single-stage maneuver Lane n/a Utilization n/a because approach is single lane Site Background This channelized turn lane (CTL) was studied as part of trip evaluating six CTLs in the Boulder, CO area.
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From page 289... ...
289 CTL - Boulder, Colorado – 28th Street and Canyon Boulevard Studied July 2014 Exhibit 3: O&M Estimated Intervention and Risky Events O&M and Observer Interventions O&M Estimated Interventions O&M Estimated Risky Events Count Rate Count Rate Boulder, CO SW n=48 4 8.33% 4 8.33% Exhibit 4: Delay Values Average Delay (sec.) Count Ave.
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From page 290... ...
290 CTL - Boulder, Colorado – 28th Street and Pearl Street (NW approach) Studied July 2014 Factor Rating Description Noise OK Visibility OK Sufficient storage downstream Lane Utilization n/a n/a because approach is single lane Exhibit 1: Traffic Volumes Exhibit 2: Special Feature Site Background The first CTL at this intersection is at the northeast quadrant of the intersection of 28th Street and Pearl Street.
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From page 291... ...
291 CTL - Boulder, Colorado – 28th Street and Pearl Street (NW approach) Studied July 2014 Exhibit 3: O&M Estimated Intervention and Risky Events O&M and Observer Interventions O&M Estimated Interventions O&M Estimated Risky Events Count Rate Count Rate Boulder, CO NW n=58 1 1.72% 0 0% Exhibit 4: Delay Values Average Delay (sec.)
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From page 292... ...
292 CTL - Boulder, Colorado – 28th Street and Pearl Street (NE approach) Studied July 2014 Exhibit 1: Traffic Volumes Exhibit 2: Special Feature Site Background The first CTL at this intersection is at the northeast quadrant of the intersection of 28th Street and Pearl Street.
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From page 293... ...
293 CTL - Boulder, Colorado – 28th Street and Pearl Street (NE approach) Studied July 2014 Exhibit 3: O&M Estimated Intervention and Risky Events O&M and Observer Interventions O&M Estimated Interventions O&M Estimated Risky Events Count Rate Count Rate Boulder, CO NE n=59 5 8.47% 7 11.86% Exhibit 4: Delay Values Average Delay (sec.)
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From page 294... ...
294 CTL - Boulder, Colorado – Foothills Parkway and Arapahoe Avenue Studied July 2014 Exhibit 1: Traffic Volume Exhibit 2: Special Feature Site Background This channelized turn lane (CTL) was studied as part of trip evaluating six CTLs in the Boulder, CO area.
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295 CTL - Boulder, Colorado – Foothills Parkway and Arapahoe Studied July 2014 Exhibit 3: O&M Estimated Intervention and Risky Events O&M and Observer Interventions O&M Estimated Interventions O&M Estimated Risky Events Count Rate Count Rate Boulder, CO SW n=60 0 0% 2 3.33% Exhibit 4: Delay Values Average Delay (sec.) Count Ave.
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From page 296... ...
296 CTL - Boulder, Colorado – Foothills and Baseline Road (NE approach) Studied July 2014 Exhibit 1: Traffic Volumes Exhibit 2: Special Feature Site Background This site features two channelized turn lanes (CTLs)
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297 CTL - Boulder, Colorado – Foothills and Baseline Road (NE approach) Studied July 2014 Exhibit 3: O&M Estimated Intervention and Risky Events O&M and Observer Interventions O&M Estimated Interventions O&M Estimated Risky Events Count Rate Count Rate Boulder, CO NE, no TRMT n=59 0 0% 1 1.69% Exhibit 4: Delay Values Average Delay (sec.)
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From page 298... ...
298 CTL - Boulder, Colorado – Foothills and Baseline Road (SW approach) Studied July 2014 Exhibit 1: Traffic Volumes Exhibit 2: Special Feature Factor Rating Description Noise OK Visibility OK Lane Utilization n/a n/a because approach is single lane Site Background This site features two channelized turn lanes (CTLs)
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299 CTL - Boulder, Colorado – Foothills and Baseline Road (SW approach) Studied July 2014 Exhibit 3: O&M Estimated Intervention and Risky Events O&M and Observer Interventions O&M Estimated Interventions O&M Estimated Risky Events Count Rate Count Rate Boulder, CO SW, Sound Strip n=60 0 0% 2 3.33% Exhibit 4: Delay Values Average Delay (sec.)
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From page 300... ...
300 CTL - Cary, North Carolina – Kildaire Farm Road and Tyron Road Studied November 2014 Exhibit 1: Traffic Volume Exhibit 2: Special Feature Site Background This channelized turn lane is at the southwest quadrant of the intersection of Kildaire Farm Road and Tyron Road in Cary, North Carolina. It features a deceleration lane, but no acceleration lane, and no pedestrian signage at the crosswalk.
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From page 301... ...
301 CTL - Cary, North Carolina – Kildaire Farm Road and Tyron Road Studied November 2014 Exhibit 3: O&M Estimated Intervention and Risky Events O&M and Observer Interventions O&M Estimated Interventions O&M Estimated Risky Events Count Rate Count Rate Cary, NC SW n=41 2 4.88% 5 12.20% Exhibit 4: Delay Values Average Delay (sec.) Count Ave.
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From page 302... ...
302 CTL - Greenbelt, Maryland – Kenilworth Avenue and East-West Studied September 2014 Factor Rating Description Noise Concerning High noise Visibility Concerning Not ideal visibility Lane Utilization n/a n/a because approach is single lane Exhibit 1: Traffic Volume Exhibit 2: Special Feature Site Background This channelized turn lane (CTL) is at northwest quadrant of the intersection of Kenilworth Avenue and West Highway Street in Greenbelt, Maryland.
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303 CTL - Greenbelt, Maryland – Kenilworth Avenue and East-West Studied September 2014 Exhibit 3: O&M Estimated Intervention and Risky Events O&M and Observer Interventions O&M Estimated Interventions O&M Estimated Risky Events Count Rate Count Rate Greenbelt MD NW n=48 5 10.42% 6 12.50% Exhibit 4: Delay Values Average Delay (sec.) Count Ave.
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304 RBT - Ann Arbor, Michigan – Ellsworth and State Road (Entry) Studied October 2014 Exhibit 1: Traffic Volume Exhibit 2: Special Feature Site Background This two-lane roundabout site is at State St.
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305 RBT - Ann Arbor, Michigan – Ellsworth and State Road (Entry) Studied October 2014 Exhibit 3: O&M Estimated Intervention and Risky Events O&M and Observer Interventions O&M Estimated Interventions O&M Estimated Risky Events Count Rate Count Rate Ann Arbor, MI West Entry n=32 0 0% 0 0% Exhibit 4: Delay Values Average Delay (sec.)
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306 RBT - Ann Arbor, Michigan – Ellsworth and State Road (Exit) Studied October 2014 Exhibit 1: Traf fic Volume Factor Rating Description Noise Concerning High exiting traffic, some trucks, lots of honking Visibility Concerning Right turn challenge close to crosswalk (despite offset)
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307 RBT - Ann Arbor, Michigan – Ellsworth and State Road (Exit) Studied October 2014 Exhibit 3: O&M Estimated Intervention and Risky Events O&M and Observer Interventions O&M Estimated Interventions O&M Estimated Risky Events Count Rate Count Rate Ann Arbor, MI West Exit n=32 1 3.13% 6 18.75% Exhibit 4: Delay Values Average Delay (sec.)
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308 RBT - Ann Arbor, Michigan – Nixon Road and Huron Parkway (Entry) Studied October 2014 Exhibit 1: Traffic Volume Exhibit 2: Special Feature Site Background This single-lane site is at Huron Parkway and Nixon Road.
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309 RBT - Ann Arbor, Michigan – Nixon Road and Huron Parkway (Entry) Studied October 2014 Exhibit 3: O&M Estimated Intervention and Risky Events O&M and Observer Interventions O&M Estimated Interventions O&M Estimated Risky Events Count Rate Count Rate Ann Arbor, MI South Entry n=40 0 0% 2 5% Exhibit 4: Delay Values Average Delay (sec.)
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310 RBT - Ann Arbor, Michigan – Nixon Road and Huron Parkway (Exit) Studied October 2014 Exhibit 1: Traffic Volume Exhibit 2: Special Feature Site Background This single-lane site is at Huron Parkway and Nixon Road.
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311 RBT - Ann Arbor, Michigan – Nixon Road and Huron Parkway (Exit) Studied October 2014 Exhibit 3: O&M Estimated Intervention and Risky Events O&M and Observer Interventions O&M Estimated Interventions O&M Estimated Risky Events Count Rate Count Rate Ann Arbor, MI South Exit n=40 0 0% 2 5% Exhibit 4: Delay Values Average Delay (sec.)
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312 RBT - Cary, North Carolina – Old Apex Road and West Chatham (Entry) Studied November 2014 Exhibit 1: Traffic Volume Exhibit 2: Special Feature Site Background This single-lane roundabout is at the intersection of Old Apex Road and West Chatham Street in Cary, North Carolina.
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313 RBT - Cary, North Carolina – Old Apex Road and West Chatham (Entry) Studied November 2014 Exhibit 3: O&M Estimated Intervention and Risky Events O&M and Observer Interventions O&M Estimated Interventions O&M Estimated Risky Events Count Rate Count Rate Cary, NC West Entry n=40 1 2.50% 3 7.50% Exhibit 4: Delay Values Average Delay (sec.)
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From page 314... ...
314 RBT - Cary, North Carolina – Old Apex Road and West Chatham (Exit) Studied November 2014 Exhibit 1: Traffic Volume Exhibit 2: Special Feature Site Background This single-lane roundabout is at the intersection of Old Apex Road and West Chatham Street in Cary, North Carolina.
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315 RBT - Cary, North Carolina – Old Apex Road and West Chatham (Exit) Studied November 2014 Exhibit 3: O&M Estimated Intervention and Risky Events O&M and Observer Interventions O&M Estimated Interventions O&M Estimated Risky Events Count Rate Count Rate Cary, NC West Exit n=41 2 4.88% 2 4.88% Exhibit 4: Delay Values Average Delay (sec.)
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316 RBT - Greenbelt, Maryland – Cherrywood and Greenbelt (Entry) Studied September 2014 Exhibit 1: Traffic Volume Exhibit 2: Special Feature Factor Rating Description Noise Concerning Exiting traffic made it difficult to hear entry Visibility OK Lane Utilization n/a n/a because approach is single lane Site Background This roundabout is at the intersection of Cherrywood Lane and Greenbelt Metro Drive in Greenbelt, Maryland.
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317 RBT - Greenbelt, Maryland – Cherrywood and Greenbelt (Entry) Studied September 2014 Exhibit 3: O&M Estimated Intervention and Risky Events O&M and Observer Interventions O&M Estimated Interventions O&M Estimated Risky Events Count Rate Count Rate Greenbelt, MD West Entry n=48 1 2.08% 1 2.08% Exhibit 4: Delay Values Average Delay (sec.)
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318 RBT - Greenbelt, Maryland – Cherrywood and Greenbelt (Exit) Studied September 2014 Exhibit 1: Traffic Volume Exhibit 2: Special Feature Site Background This roundabout is at the intersection of Cherrywood Lane and Greenbelt Metro Drive in Greenbelt, Maryland.
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From page 319... ...
319 RBT - Greenbelt, Maryland – Cherrywood and Greenbelt (Exit) Studied September 2014 Exhibit 3: O&M Estimated Intervention and Risky Events O&M and Observer Interventions O&M Estimated Interventions O&M Estimated Risky Events Count Rate Count Rate Greenbelt, MD West Exit n=50 2 4.00% 7 14% Exhibit 4: Delay Values Average Delay (sec.)
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From page 320... ...
320 RBT - Hilliard, Ohio – Cemetery Road and Main Street (W Entry) Studied May 2014 Exhibit 1: Traffic Volumes Exhibit 2: Special Feature Site Background This roundabout has two‐lane entries and exits at all approaches and is outfitted with in‐road yield‐to‐pedestrian warning signs.
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321 RBT - Hilliard, Ohio – Cemetery Road and Main Street (W Entry) Studied May 2014 Exhibit 3: O&M Estimated Intervention and Risky Events O&M and Observer Interventions O&M Estimated Interventions O&M Estimated Risky Events Count Rate Count Rate Hilliard, OH West Entry n=53 1 1.9% 13 25% Exhibit 4: Delay Values Average Delay (sec.)
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322 RBT - Hilliard, Ohio – Cemetery Road and Main Street (W Exit) Studied May 2014 Exhibit 1: Traffic Volumes Exhibit 2: Special Feature Site Background This roundabout has two‐lane entries and exits at all approaches and is outfitted with in‐road yield‐to‐pedestrian warning signs.
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323 RBT - Hilliard, Ohio – Cemetery Road and Main Street (W Exit) Studied May 2014 Exhibit 3: O&M Estimated Intervention and Risky Events O&M and Observer Interventions O&M Estimated Interventions O&M Estimated Risky Events Count Rate Count Rate Hilliard, OH West Exit n=56 8 14% 6 11% Exhibit 4: Delay Values Average Delay (sec.)
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324 RBT - Hilliard, Ohio – Cemetery Road and Main Street (E Entry) Studied May 2014 Exhibit 1: Traffic Volumes Exhibit 2: Special Feature Site Background This roundabout has two‐lane entries and exits at all approaches and is outfitted with in‐road yield‐to‐pedestrian warning signs.
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325 RBT - Hilliard, Ohio – Cemetery Road and Main Street (E Entry) Studied May 2014 Exhibit 3: O&M Estimated Intervention and Risky Events O&M and Observer Interventions O&M Estimated Interventions O&M Estimated Risky Events Count Rate Count Rate Hilliard, OH East Entry n=60 1 1.7% 7 12% Exhibit 4: Delay Values Average Delay (sec.)
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326 RBT - Hilliard, Ohio – Cemetery Road and Main Street (E Exit) Studied May 2014 Exhibit 1: Traffic Volumes Exhibit 2: Special Feature Site Background This roundabout has two‐lane entries and exits at all approaches and is outfitted with in‐road yield‐to‐pedestrian warning signs.
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327 RBT - Hilliard, Ohio – Cemetery Road and Main Street (E Exit) Studied May 2014 Exhibit 3: O&M Estimated Intervention and Risky Events O&M and Observer Interventions O&M Estimated Interventions O&M Estimated Risky Events Count Rate Count Rate Hilliard, OH East Exit n=60 4 6.7% 7 12% Exhibit 4: Delay Values Average Delay (sec.)
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328 RBT - Novi, Michigan – Maple Road and Farmington Road (S Entry) Studied August 2014 Exhibit 1: Traffic Volumes Exhibit 2: Special Feature Site Background This multi-lane roundabout is at Maple Road and Farmington Road.
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329 RBT - Novi, Michigan – Maple Road and Farmington Road (S Entry) Studied August 2014 Exhibit 3: O&M Estimated Intervention and Risky Events O&M and Observer Interventions O&M Estimated Interventions O&M Estimated Risky Events Count Rate Count Rate Novi, MI South Entry n=36 0 0% 1 2.78% Exhibit 4: Delay Values Average Delay (sec.)
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330 RBT - Novi, Michigan – Maple Road and Farmington Road (N Exit) Studied August 2014 Exhibit 1: Traffic Volumes Exhibit 2: Special Feature Site Background This multi-lane roundabout is at Maple Road and Farmington Road.
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331 RBT - Novi, Michigan – Maple Road and Farmington Road (N Exit) Studied August 2014 Exhibit 3: O&M Estimated Intervention and Risky Events O&M and Observer Interventions O&M Estimated Interventions O&M Estimated Risky Events Count Rate Count Rate Novi, MI North Exit n=42 3 7.14% 7 16.67% Exhibit 4: Delay Values Average Delay (sec.)
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332 RBT - Novi, Michigan – Maple Road and Farmington Road (E Entry) Studied August 2014 Exhibit 1: Traffic Volumes Exhibit 2: Special Feature Site Background This multi-lane roundabout is at Maple Road and Farmington Road.
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333 RBT - Novi, Michigan – Maple Road and Farmington Road (E Entry) Studied August 2014 Exhibit 3: O&M Estimated Intervention and Risky Events O&M and Observer Interventions O&M Estimated Interventions O&M Estimated Risky Events Count Rate Count Rate Novi, MI East Entry n=31 0 0% 2 6.45% Exhibit 4: Delay Values Average Delay (sec.)
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334 RBT - Novi, Michigan – Maple Road and Farmington Road (E Exit) Studied August 2014 Exhibit 1: Traffic Volumes Exhibit 2: Special Feature Site Background This multi-lane roundabout is at Maple Road and Farmington Road.
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335 RBT - Novi, Michigan – Maple Road and Farmington Road (E Exit) Studied August 2014 Exhibit 3: O&M Estimated Intervention and Risky Events O&M and Observer Interventions O&M Estimated Interventions O&M Estimated Risky Events Count Rate Count Rate Novi, MI East Exit n=32 0 0% 4 12.50% Exhibit 4: Delay Values Average Delay (sec.)
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From page 336... ...
336 14 REFERENCES American Association of State Highway and Transportation Officials. A Policy on Geometric Design of Highways and Streets, 6th Edition.
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337 Guth, D., D Ashmead, R
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338 NIH National Institutes of Health, NIH. NIH/NEI Bioengineering Research Partnership Grant R01 EY12894-03, 2010.
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From page 339... ...
339 Schroeder, Bastian; Hughes, Ronald; Rouphail, Nagui; Cunningham, Christopher; Salamati, Katy; Long, Richard; Guth, David; Emerson, Robert Wall; Kim, Dae; Barlow, Janet; Bentzen, Billie Louise; Rodegerdts, Lee; Myers, Ed. Crossing Solutions at Roundabouts and Channelized Turn Lanes for Pedestrians with Vision Disabilities.
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