Draft/Conceptual Draft/Conceptual Engineering Solutions Engineering Solutions for Americans with for Americans with Disabilities Act (ADA) Disabilities Act (ADA) Compliance Compliance by the by the NYSDOT Pedestrian & Bicycle NYSDOT Pedestrian & Bicycle Program Program for for Pro Walk/Pro Bike 2004 Pro Walk/Pro Bike 2004 September 8, 2004 September 8, 2004
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Draft/Conceptual Engineering Solutions for Americans with Disabilities Act (ADA) Compliance
Draft/Conceptual Engineering Solutions for Americans with Disabilities Act (ADA) Compliance. by the NYSDOT Pedestrian & Bicycle Program for Pro Walk/Pro Bike 2004 September 8, 2004. Goal: Obtain ADA Compliance for Roundabouts Without Gridlock. Engineering A Path To Accessibility And Safety. - PowerPoint PPT Presentation
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Draft/Conceptual Draft/Conceptual Engineering Solutions for Engineering Solutions for
Americans with Disabilities Americans with Disabilities Act (ADA) ComplianceAct (ADA) Compliance
by theby the
NYSDOT Pedestrian & Bicycle ProgramNYSDOT Pedestrian & Bicycle Program
forfor
Pro Walk/Pro Bike 2004Pro Walk/Pro Bike 2004
September 8, 2004September 8, 2004
Goal: Obtain ADA Compliance Goal: Obtain ADA Compliance for Roundabouts Without for Roundabouts Without
GridlockGridlock..
Engineering A Path To Engineering A Path To Accessibility And SafetyAccessibility And Safety
1. Chronology of Major Events.1. Chronology of Major Events.2. Prior Research Findings.2. Prior Research Findings.3. Current Research Activity.3. Current Research Activity.4. Access vs. Safety Dichotomy 4. Access vs. Safety Dichotomy 5. Motorist Compliance with/without Signals.5. Motorist Compliance with/without Signals.6. Goals for Optimal Roundabout Conditions.6. Goals for Optimal Roundabout Conditions.7. Draft Conceptual Engineering Solutions.7. Draft Conceptual Engineering Solutions.8. Next Steps/Implications Beyond ADA8. Next Steps/Implications Beyond ADA9. Concluding Observations9. Concluding Observations
ChronologyChronology ofof MajorMajor EventsEvents
Building A True CommunityBuilding A True Community, Access Board, , Access Board, PROWAAC, 2001PROWAAC, 2001
Draft Guidelines for Accessible Public ROW, Draft Guidelines for Accessible Public ROW, Access Board, 2002Access Board, 2002
NCHRP 3-78, Crossing Solutions at NCHRP 3-78, Crossing Solutions at Roundabouts… is expected to begin Fall 2004Roundabouts… is expected to begin Fall 2004
Prior Research FindingsPrior Research Findings
Pedestrians with vision disabilities took up to Pedestrians with vision disabilities took up to 6 seconds longer to detect gaps.6 seconds longer to detect gaps.
Few safe/crossable gaps when traffic is Few safe/crossable gaps when traffic is moderate to heavy.moderate to heavy.
Difficult using audible cues when traffic is Difficult using audible cues when traffic is moderate to heavy.moderate to heavy.
Current Research ActivityCurrent Research ActivityNCHRP 3-78, Crossing Solutions at NCHRP 3-78, Crossing Solutions at Roundabouts and Channelized Turn Lanes for Roundabouts and Channelized Turn Lanes for Pedestrian with Vision Disabilities.Pedestrian with Vision Disabilities.
National Eye Institute of the National Institute of National Eye Institute of the National Institute of Health (on Blind Pedestrian Access to Complex Health (on Blind Pedestrian Access to Complex Intersections).Intersections).
NCHRP 3-72: Lane Widths, Channelized Right NCHRP 3-72: Lane Widths, Channelized Right Turns, and Right Turn Deceleration Lanes in Turns, and Right Turn Deceleration Lanes in Urban and Suburban Areas.Urban and Suburban Areas.
NCHRP 3-65: Applying Roundabouts in the US.NCHRP 3-65: Applying Roundabouts in the US.
Access Versus Safety Access Versus Safety Dichotomy – Basic Dichotomy – Basic
Left turns during Left turns during concurrent phasing.concurrent phasing.
Up to 1/3 of crashes at Up to 1/3 of crashes at the green “walk” phase.the green “walk” phase.
Roundabout SafetyRoundabout Safety
1 lane roundabout has 1 lane roundabout has 8 pedestrian/vehicle 8 pedestrian/vehicle conflict points.conflict points.
Splitter island is a Splitter island is a pedestrian refuge.pedestrian refuge.
Shorter/one way Shorter/one way pedestrian crossing.pedestrian crossing.
Lower speed is Lower speed is enforced by design.enforced by design.
Motorist ComplianceMotorist ComplianceWith Or Without SignalsWith Or Without Signals
Depend on motorists to stop at red, and yield Depend on motorists to stop at red, and yield before RTOR and left turn movements.before RTOR and left turn movements.
4-way, 2 lane signalized intersection speeds 4-way, 2 lane signalized intersection speeds can still be double roundabout speeds.can still be double roundabout speeds.
Its easier to yield and/or stop traveling at 15 - Its easier to yield and/or stop traveling at 15 - 20 mph, than 40 mph.20 mph, than 40 mph.
At 15 - 20 mph, you can’t credibly claim “you At 15 - 20 mph, you can’t credibly claim “you didn’t see them” (the motorist is culpable). didn’t see them” (the motorist is culpable).
Goals For Optimal Goals For Optimal Roundabout ConditionsRoundabout Conditions
Obtain full ADA compliance.Obtain full ADA compliance.
Design speed is self-enforcing.Design speed is self-enforcing.
Works for all users and modes.Works for all users and modes.
Consider all traffic control systems.Consider all traffic control systems.
Multimodal design is essential.Multimodal design is essential.
Consider Methods To Consider Methods To Determine Gaps And Way-Determine Gaps And Way-
Finding NeedsFinding NeedsSensors that alert pedestrians (audible Sensors that alert pedestrians (audible message for “real time/true presence” info.) message for “real time/true presence” info.) whether a safe crossable gap is available.whether a safe crossable gap is available.
Calming “green wave” signal progressions for Calming “green wave” signal progressions for creating platoons conducive to safe crossable creating platoons conducive to safe crossable gaps at roundabout crossings.gaps at roundabout crossings.
Sensor-based “ramp metering” as a means of Sensor-based “ramp metering” as a means of creating gaps/providing notice of those gaps.creating gaps/providing notice of those gaps.
Criteria for when/if fixed signals and separate Criteria for when/if fixed signals and separate rights-of-way are warranted.rights-of-way are warranted.
Pedestrian warning, gap creation systems,Pedestrian warning, gap creation systems,
Stop-go signals/separate ROW if needed.Stop-go signals/separate ROW if needed.
Draft/Conceptual Baseline Draft/Conceptual Baseline Accommodation For Accommodation For
Multilane RoundaboutsMultilane Roundabouts
Baseline accommodation from 2 prior slides,Baseline accommodation from 2 prior slides,
Greater emphasis at crosswalks (pavement Greater emphasis at crosswalks (pavement warning text, in-roadway devices & overhead warning text, in-roadway devices & overhead signing to avoid multiple threat crashes),signing to avoid multiple threat crashes),
Design must Design must avoidavoid speed differentials that speed differentials that contribute to multiple threats crashes,contribute to multiple threats crashes,
If space/budget permits, provide alternative If space/budget permits, provide alternative route or separate ROW for non-motor modes. route or separate ROW for non-motor modes.
Next StepsNext Steps
Access Board issues a Notice of Proposed Access Board issues a Notice of Proposed Rulemaking (NPRM) for public comment.Rulemaking (NPRM) for public comment.
Access Board adopts Accessible Public ROW Access Board adopts Accessible Public ROW Guidelines.Guidelines.
USDOT & USDOJ must adopt Accessible Public USDOT & USDOJ must adopt Accessible Public ROW Guidelines for them to become regulation ROW Guidelines for them to become regulation and be enforceable.and be enforceable.
Possible Implications Possible Implications Beyond ADABeyond ADA
Advancing empirical, Advancing empirical, simulation model, and simulation model, and human subject research. human subject research.
Benefit access & safety Benefit access & safety at roundabouts and at roundabouts and signaled intersections.signaled intersections.
Anticipate increased Anticipate increased emphasis and support emphasis and support for pedestrian travel.for pedestrian travel.
Concluding ObservationsConcluding Observations
Engineering measures Engineering measures may result in may result in safesafe access access comparable or better than comparable or better than signalized intersections.signalized intersections.
Thoughtful dialogue and Thoughtful dialogue and ongoing research can help ongoing research can help make all transportation make all transportation facilities more accessible. facilities more accessible.
Questions & Comments Questions & Comments Are Welcomed!Are Welcomed!
For Further Information, Please Contact:For Further Information, Please Contact: