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TRANSCRIPT
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Designing for Pedestrian Safety
Treatments at Unsignalized
Pedestrian Crossings
Presented by:
Charlie Zegeer
PBIC Director
August 17, 2010
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3‐2Designing for Pedestrian Safety – Unsignalized Crossings
Crossing Crashes
Part 1: General Principles
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3‐3Designing for Pedestrian Safety – Unsignalized Crossings
Why do people cross the street?
Because there’s someplace good on the other side
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3‐4Designing for Pedestrian Safety – Unsignalized Crossings
People shouldn’t have to run to cross a street
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3‐5Designing for Pedestrian Safety – Unsignalized Crossings
People shouldn’t have to run to cross a street
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3‐6Designing for Pedestrian Safety – Unsignalized Crossings
Ideally, we’d always cross at locations with positive control
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3‐7Designing for Pedestrian Safety – Unsignalized Crossings
But we can’t provide signals everywhere people cross
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3‐8Designing for Pedestrian Safety – Unsignalized Crossings
These people are not criminals…
They’re simply trying to deal with a situation
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3‐9Designing for Pedestrian Safety – Unsignalized Crossings
Pedestrian behavior varies: Some use crosswalks, others don’t
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3‐10Designing for Pedestrian Safety – Unsignalized Crossings
Principle # 1
Pedestrians want & need to cross the street safely
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3‐11Designing for Pedestrian Safety – Unsignalized Crossings
Principle # 2
Drivers need to understand pedestrians’
intent
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3‐12Designing for Pedestrian Safety – Unsignalized Crossings
Principle # 3
Keep Crossings Short
Impacts of long crossing distance:
Increases exposure time
Increases vehicle‐pedestrian conflict
Increases vehicle delay
Decreases ability of slower pedestrians to cross
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3‐13Designing for Pedestrian Safety – Unsignalized Crossings
Principle # 4: Speed Matters
1.
Drivers’
field of vision & ability to see pedestrians
2.
Drivers’
ability to react and avoid a crash
3.
Crash Severity
15 MPH
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3‐14Designing for Pedestrian Safety – Unsignalized Crossings
As speed increases, driver focuses less on surroundings
15 MPH
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3‐15Designing for Pedestrian Safety – Unsignalized Crossings
As speed increases, driver focuses less on surroundings
20 MPH
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3‐16Designing for Pedestrian Safety – Unsignalized Crossings
As speed increases, driver focuses less on surroundings
25 MPH
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3‐17Designing for Pedestrian Safety – Unsignalized Crossings
As speed increases, driver focuses less on surroundings
30 MPH
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3‐18Designing for Pedestrian Safety – Unsignalized Crossings
Speed Affects Crash Avoidance
High speeds equate to greater reaction and stopping distance
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3‐19Designing for Pedestrian Safety – Unsignalized Crossings
Speed Affects Crash Severity
High speeds lead to greater chance of serious injury & death
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3‐20Designing for Pedestrian Safety – Unsignalized Crossings
Traffic-calming methods such as curb extensions help slow traffic
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3‐21Designing for Pedestrian Safety – Unsignalized Crossings
Principle #5
Pedestrians will cross where it’s most convenient
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3‐22Designing for Pedestrian Safety – Unsignalized Crossings
Midblock vs. Intersection
People choose based on their perceived risk
The data is inconclusive
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3‐23Designing for Pedestrian Safety – Unsignalized Crossings
Crossing Crashes
Part 2: Countermeasures
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3‐24Designing for Pedestrian Safety – Unsignalized Crossings
Basic Street Crossing Measures
Crosswalks
Illumination
Signs
Striping
Medians/pedestrian islands
Signals
Over/undercrossings
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3‐25Designing for Pedestrian Safety – Unsignalized Crossings
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3‐26Designing for Pedestrian Safety – Unsignalized Crossings
Crosswalks
Crosswalk FAQ’s:
Why are they marked?
Where should they be marked?
Do marked crosswalks increase safety, or provide a “false sense of security?”
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3‐27Designing for Pedestrian Safety – Unsignalized Crossings
1. Why are crosswalks provided?
To indicate to pedestrians where to cross
To indicate to drivers where to expect pedestrians
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3‐28Designing for Pedestrian Safety – Unsignalized Crossings
2. How to determine where to mark a crosswalk?
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3‐29Designing for Pedestrian Safety – Unsignalized Crossings
2. How to determine where to mark a crosswalk?
MUTCD Guidance on Crosswalks (2009):
Crosswalk markings provide guidance for pedestrians who are crossing roadways by defining and delineating paths on approaches to and within signalized intersections, and on approaches to other intersections where traffic stops.
In conjunction with signs and other measures, crosswalk markings help to alert road users of a designated pedestrian crossing point across the roadway at locations that are not controlled by traffic control signals or STOP or YIELD signs. Crosswalk lines should not be used indiscriminately.
An engineering study should be performed before a marked crosswalk is installed at a location away from a traffic signal or an approach controlled by a STOP or YIELD sign.
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3‐30Designing for Pedestrian Safety – Unsignalized Crossings
2. How to determine where to mark a crosswalk?
Consider origins and destinations
In this case, apartments across from bus stop & stores
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3‐31Designing for Pedestrian Safety – Unsignalized Crossings
Many Locations are not Suitable for a Marked Crosswalk
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3‐32Designing for Pedestrian Safety – Unsignalized Crossings
Not a good location for a marked crosswalk:
No particular reason for driver to expect pedestrians
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3‐33Designing for Pedestrian Safety – Unsignalized Crossings
Not a good location for a marked crosswalk:
Poor sight distance
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3‐34Designing for Pedestrian Safety – Unsignalized Crossings
Many Locations are Suitable for a Marked Crosswalk
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3‐35Designing for Pedestrian Safety – Unsignalized Crossings
Suitable location for a marked crosswalk:
Two‐lane, high use, driver expectancy
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3‐36Designing for Pedestrian Safety – Unsignalized Crossings
Suitable location for a marked crosswalk:
Slow speed, high use, driver expectancy
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3‐37Designing for Pedestrian Safety – Unsignalized Crossings
3. Do marked crosswalks increase safety, or encourage people to cross without looking?
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3‐38Designing for Pedestrian Safety – Unsignalized Crossings
Results of Most Recent Study (Zegeer et al 2002)
Marked vs. Unmarked Analysis
Two‐lane roads: No significant difference in crashes
Multilane roads (3 or more lanes)
Under 12,000 ADT: no significant difference in crashes
Over 12,000 ADT w/ no median: crashes marked > crashes unmarked
Over 15,000 ADT & w/ median: crashes marked > crashes unmarked
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3‐39Designing for Pedestrian Safety – Unsignalized Crossings
Study Results
Median reduces crashes by 40%
Pedestrians over 65 are over‐represented in crosswalk crashes
Pedestrians are not less vigilant in marked crosswalks:
Looking behavior increased after crosswalks installed
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3‐40Designing for Pedestrian Safety – Unsignalized Crossings
Study Results
Crashes correlate with ADT & number of travel lanes.
Other studies have shown same results
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3‐41Designing for Pedestrian Safety – Unsignalized Crossings
One explanation of higher crash rate at marked crosswalks: multiple-threat crash
1st car stops too close, masks visibility for driver in 2nd lane
Solution: advance stop bar (comes later…)
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3‐42Designing for Pedestrian Safety – Unsignalized Crossings
Study Recommendations
1.
OK to mark crosswalks on 2‐lane roadways
2.
On multi‐lane roadways, marked crosswalks alone are not
recommended on roadways with:ADT > 12,000 w/o median
ADT > 15,000 w median*
Speeds greater than 40 mph
3.
Use raised medians to reduce risk
4.
Signals or other treatments should be considered where
many young and/or elderly pedestrians
Note: effect of advance stop bar not studied (none at any observed sites)
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3‐43Designing for Pedestrian Safety – Unsignalized Crossings
Change to 2009 MUTCD“New marked crosswalks alone, without other measures designed to reduce traffic speeds, shorten crossing distances, enhance driver awareness of the crossing, and/or provide active warning of pedestrian presence, should not be installed across uncontrolled roadways where the speed limit exceeds 40 mph and either:
A. The roadway has four or more lanes of travel without a raised median or pedestrian refuge island and an ADT of 12,000 vehicles per day or greater;
or
B. The roadway has four or more lanes of travel with a raised median or pedestrian refuge island and an ADT of 15,000 vehicles per day or greater.”
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3‐44Designing for Pedestrian Safety – Unsignalized Crossings
Increase Effectiveness Of Crosswalks With:
Proper location
High Visibility Markings
Illumination
Signing
Advance Stop Bars
Median Islands
Curb Extensions
Signals
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3‐45Designing for Pedestrian Safety – Unsignalized Crossings
Key Quotes from the Study Conclusion
“When considering marked crosswalks at uncontrolled locations, the question should not be simply, “Should I provide a marked crosswalk or not?”…
“Regardless of whether marked crosswalks are used, there remains the fundamental obligation to get pedestrians safely across the street. In most cases, marked crosswalks are best used in combination with other treatments (e.g., curb extensions, raised crossing islands, traffic signals, roadway narrowing, enhanced overhead lighting, traffic calming measures)….”
“In all cases, the final design must accomplish the goal of getting pedestrians across the road safely….”
“The design question is, “How can this task [getting pedestrians across the road safely] best be accomplished?”
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3‐46Designing for Pedestrian Safety – Unsignalized Crossings
Marked crosswalk must be visible to the DRIVER
What the pedestrian sees
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3‐47Designing for Pedestrian Safety – Unsignalized Crossings
Marked crosswalk must be visible to the DRIVER
What the driver sees (same crosswalk)
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3‐48Designing for Pedestrian Safety – Unsignalized Crossings
Crosswalk Visibility
Crosswalk Marking TypesCrosswalk Marking Types
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3‐49Designing for Pedestrian Safety – Unsignalized Crossings
Longitudinal markings with transverse markings – very visible
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3‐50Designing for Pedestrian Safety – Unsignalized Crossings
Place longitudinal markings placed to avoid wheel tracks, reducing wear & tear & maintenance
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3‐51Designing for Pedestrian Safety – Unsignalized Crossings
Staggered ladder improves visibility from afar
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3‐52Designing for Pedestrian Safety – Unsignalized Crossings
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3‐53Designing for Pedestrian Safety – Unsignalized Crossings
Illumination – Essential For Any Crossing
Marked crosswalk?
Light it.
Up to 50% of ped crashes occur at night
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3‐54Designing for Pedestrian Safety – Unsignalized Crossings
Illumination!
Lighting reduces the odds of pedestrian fatalities:
by 42% at midblock locations
by 54% at intersections
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3‐55Designing for Pedestrian Safety – Unsignalized Crossings
Informational Report on Lighting Design for Midblock Crosswalks
FHWA‐HRT‐08‐053
April 2008
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3‐56Designing for Pedestrian Safety – Unsignalized Crossings
Sample Illustrations from New FHWA Report
Recommended lighting level: 20 lux
at 5’
above pavement
Available at http://www.tfhrc.gov/safety/pubs/08053/08053.pdf
Fig 11. Traditional midblock
crosswalk lighting layout
Fig 12. New design for midblock
crosswalk lighting layout
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3‐57Designing for Pedestrian Safety – Unsignalized Crossings
Fig 13. Traditional intersection
lighting layout
Fig 14. New design for intersection
lighting layout for crosswalks.
Fig 15. New design for
wide roadway
intersection lighting
layout for crosswalks
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3‐58Designing for Pedestrian Safety – Unsignalized Crossings
Ped crossing signs: old vs. new MUTCD standards
Placement
Old
New
Primary Location: in advance
of crosswalk
Supplemental at
crosswalk
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3‐59Designing for Pedestrian Safety – Unsignalized Crossings
R1‐6aR1‐6
MUTCD signsYield or Stop depends
on state law
In-street pedestrian crossing signs
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3‐60Designing for Pedestrian Safety – Unsignalized Crossings
In-street signs increase yield rates, especially on slow-speed streets
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3‐61Designing for Pedestrian Safety – Unsignalized Crossings
Rectangular Rapid Flash LED Beacon
Received Interim approval to MUTCD with separate warrants for use
Studies indicate motorist yield rates increased from about 20% to 80%
Beacon is yellow, rectangular, and has a rapid “wig‐wag” flash
Beacon located between the warning sign and the arrow plaque
Must be pedestrian activated (pushbutton or passive)
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3‐62Designing for Pedestrian Safety – Unsignalized Crossings
Beacons required on the both right side and on the left side or in a median if practical
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3‐63Designing for Pedestrian Safety – Unsignalized Crossings
Advance Stop or Yield Line: Reduces Multiple‐threat Crashes
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3‐64Designing for Pedestrian Safety – Unsignalized Crossings
Multiple Threat Crash Problem
1st car stops to let pedestrian cross, blocking sight lines
2nd car doesn’t stop, hits pedestrian at high speed
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3‐65Designing for Pedestrian Safety – Unsignalized Crossings
Multiple Threat Crash Solution
Advance stop/yield line
1st car stops further back, opening up sight lines
2nd car can be seen by pedestrian
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3‐66Designing for Pedestrian Safety – Unsignalized Crossings
Signs in the 2003 MUTCD
(Use where local law says yield
to pedestrians)
R1‐5 R1‐5a
R1‐5cR1‐5b
Signs in the 2009 MUTCD
(Use where local law says stop
for pedestrians)
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3‐67Designing for Pedestrian Safety – Unsignalized Crossings
Advanced yield line (shark’s teeth) & sign
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3‐68Designing for Pedestrian Safety – Unsignalized Crossings
Advanced stop line and sign
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3‐69Designing for Pedestrian Safety – Unsignalized Crossings
MUTCD recommends 20’ to 50’ setback 30’ preferred for maximum effectiveness
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3‐70Designing for Pedestrian Safety – Unsignalized Crossings
Marking a Crosswalk Summary
When is it OK to mark a crosswalk without other treatments?
2‐lane roads < 40 mph
Multi‐lane roads w/ ADT < 12,000 or 15,000 (median)
How can you increase the effectiveness of marked crosswalks?
Marked crosswalk: Add median, advance stop line
Textured crosswalks: Smooth and white is best
Signs: In road; supplement with striping
In all cases (nighttime): Illumination!
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3‐71Designing for Pedestrian Safety – Unsignalized Crossings
Raised Medians And Islands Reduce Pedestrian Crashes:
At marked crosswalks
CRF = 46%
At unmarked crosswalks
CRF = 39%
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3‐72Designing for Pedestrian Safety – Unsignalized Crossings
Continuous raised median – basic principle:
Breaks long complex crossing into two simpler crossings
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3‐73Designing for Pedestrian Safety – Unsignalized Crossings
A flush median is not a refuge
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3‐74Designing for Pedestrian Safety – Unsignalized Crossings
Add a raised island
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3‐75Designing for Pedestrian Safety – Unsignalized Crossings
Crossing island at marked crosswalk - same principle:
Breaks long complex crossing into two simpler crossings
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3‐76Designing for Pedestrian Safety – Unsignalized Crossings
Option:
stagger or angle cut‐through so pedestrians face oncoming traffic before 2nd crossing
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3‐77Designing for Pedestrian Safety – Unsignalized Crossings
Pedestrian Signal
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3‐78Designing for Pedestrian Safety – Unsignalized Crossings
Now easier to meet pedestrian volume warrant
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3‐79Designing for Pedestrian Safety – Unsignalized Crossings
Provide a HOT response
Otherwise pedestrians won't wait for the light
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3‐80Designing for Pedestrian Safety – Unsignalized Crossings
If wait is too long, pedestrians will seek gaps
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3‐81Designing for Pedestrian Safety – Unsignalized Crossings
And then traffic waits for no reason
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3‐82Designing for Pedestrian Safety – Unsignalized Crossings
Pedestrian Signal22‐‐stage crossing increases effectiveness stage crossing increases effectiveness
and disrupts traffic lessand disrupts traffic less
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3‐83Designing for Pedestrian Safety – Unsignalized Crossings
Stage 1: Pedestrian stops traffic in one direction
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3‐84Designing for Pedestrian Safety – Unsignalized Crossings
Stage 1: Pedestrian crosses to median island
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3‐85Designing for Pedestrian Safety – Unsignalized Crossings
Stage 1 over: Traffic in one direction resumes
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3‐86Designing for Pedestrian Safety – Unsignalized Crossings
Stage 2: Pedestrian stops traffic in other direction
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3‐87Designing for Pedestrian Safety – Unsignalized Crossings
Stage 2 over: Traffic resumes
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3‐88Designing for Pedestrian Safety – Unsignalized Crossings
Detail 1: Requires pedestrian push button on island
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3‐89Designing for Pedestrian Safety – Unsignalized Crossings
Detail 2: Fences force pedestrians to walk against on-coming traffic
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3‐90Designing for Pedestrian Safety – Unsignalized Crossings
Pedestrian Hybrid Beacon aka “HAWK” (High Intensity Activated Crosswalk)
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3‐91Designing for Pedestrian Safety – Unsignalized Crossings
Drivers see Hybrid Beacon
Peds
see Pedhead
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3‐92Designing for Pedestrian Safety – Unsignalized Crossings
11
22
33
44
55
ReturnReturn to 1to 1
Flashing Flashing
yellowyellow
Blank forBlank fordriversdrivers
Steady Steady
yellowyellow
Steady redSteady red
WigWig‐‐WagWag
Hybrid Beacon Sequence
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3‐93Designing for Pedestrian Safety – Unsignalized CrossingsDesigning for Pedestrian Safety – Crossing Countermeasures
Over & Undercrossings
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3‐94Designing for Pedestrian Safety – Unsignalized Crossings
In theory, grade separation = no conflicts
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3‐95Designing for Pedestrian Safety – Unsignalized Crossings
In reality, pedestrians often ignore structures
Placing themselves in greater danger
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3‐96Designing for Pedestrian Safety – Unsignalized Crossings
Sometimes fences are needed to direct users
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3‐97Designing for Pedestrian Safety – Unsignalized Crossings
To connect buildings To connect land uses
To cross freeways Light rail stations
Grade separationGrade separation is more useful for purposes beyond simply crossing from sidewalk to sidewalk
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3‐98Designing for Pedestrian Safety – Unsignalized Crossings
ADA requires a ramp
Overcrossings are expensive because of their height, which requires long ramps
Overcrossings
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3‐99Designing for Pedestrian Safety – Unsignalized Crossings
Undercrossings require generous dimensions to be attractive: security is the main issue
Users must see light at the end of the tunnel
Undercrossings
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3‐100Designing for Pedestrian Safety – Unsignalized Crossings
Undercrossing must not intimidate potential user
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3‐101Designing for Pedestrian Safety – Unsignalized Crossings
Elevated roadway allows open, airy undercrossing
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3‐102Designing for Pedestrian Safety – Unsignalized Crossings
Undercrossings work best if well lit & attractive
Light provided by design
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3‐103Designing for Pedestrian Safety – Unsignalized Crossings
Over/undercrossings should be a last resort
Why are they not effective for street crossings?
They add out‐of‐direction travel
When are they useful?
To connect land uses separated by a major roadway
How can you increase their effectiveness?
By providing a direct route
By providing security
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3‐104Designing for Pedestrian Safety – Unsignalized Crossings
Crossing treatments cost comparison:
Treatment Cost EffectivenessSigning $500 –
1,000 *
High visibility markings $2,000 –
15,000 **
Advance stop bars $1,000 –
2,000 ****
Illumination $5,000 –
15,000 ****
Median Islands $10,000 –
30,000 ****
Signals $35,000 –
150,000 ***
Over/undercrossings $500,000 –
2,000,000 *
Proper location “Priceless” *****
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3‐105Designing for Pedestrian Safety – Unsignalized Crossings
“Right design invites right use”
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3‐106Designing for Pedestrian Safety – Unsignalized Crossings
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3‐107Designing for Pedestrian Safety – Unsignalized Crossings
Education: Transit Riders
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3‐108Designing for Pedestrian Safety – Unsignalized Crossings
Education: The Elderly
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3‐109Designing for Pedestrian Safety – Unsignalized Crossings
Driver Education & Enforcement
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3‐110Designing for Pedestrian Safety – Unsignalized Crossings
Questions?
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3‐111Designing for Pedestrian Safety – Unsignalized Crossings
Thank You!
Additional Resources
Engineering solutions: http://www.walkinginfo.org/engineering
FAQs: http://www.walkinginfo.org/faqs, subject heading “engineering”
2‐ and 3‐day Training courses: “Designing and Planning for Pedestrian Safety”http://www.walkinginfo.org/training
Next PBIC Livable Communities Webinar:
“Community Approaches to Pedestrian Safety Education”Thursday, March 18, 2‐3:30pm ETRegister at http://www.walkinginfo.org/webinars
Archive at http://www.walkinginfo.org/webinarsDownloadable and streaming recording, transcript, presentation slides
Questions?
Call Jeremy Pinkham, UNC Highway Safety Research Center, 919‐843‐4859
Write to [email protected]