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Preventing Worker Deaths When Struck By Construction Equipment PDF Version PPT Version National Institute for Occupational Safety and Health (NIOSH)
 

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Jennifer Beaupre, Matt Hause, Bob Hammer

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Presented at the 14th Annual Construction Safety Conference & Exposition, Rosemont, IL, February 2004.

There are addtional presenter notes within the PowerPoint file that are not shown here.

Prevention Measures

Administrative Controls
  • Backing Safety Program
  • Internal Traffic Control Plans

Engineering Controls

  • Proximity Warning Systems

Administrative Controls




Key Elements of a Vehicle Backing Safety Program
  • Equipment designed to minimize blind areas
  • Equipment inspections/preventative maintenance
  • Layout work areas to avoid backing
  • Use of spotters
  • Training for operators and workers on foot
  • Use of high visibility vests
  • Use of other backing safety devices (engineering controls)
Backing Safety Program Prevention Measures

Equipment designed to minimize blind areas





Operator Training:
  • Avoid having to backup
  • Do walk around
  • Be aware of blind areas
  • Use a spotter
Worker Training:
  • Be aware of equipment blind areas
  • Stay out of all blind areas and swing radius
  • Make positive eye contact with operators
Operator Human Factors
  • Expectancy
  • Perception time
  • Reaction time
  • Ability



Backing Safety Program Prevention Measures

Worker Visibility:
  • Require workers to wear high-visibility clothing.
  • Apparel that covers moving parts of the body is best.
  • Consider apparel with different designs front and back.
Internal Traffic Control Plans




Why Develop an Internal Traffic Control Plan?
  • Coordinate vehicle/equipment movement inside the work zone
  • Limit exposure of workers on foot to construction traffic
  • Reduce hazards for equipment operators
Traffic Control Plans



Proposed Definition of Internal Traffic Control Plans (ITCP)



“STRATEGIES TO CONTROL THE FLOW OF CONSTRUCTION WORKERS, VEHICLES AND EQUIPMENT INSIDE THE WORKZONE”

ITCP Principles of Safe Construction Traffic Control
  • Reducing the need to back up equipment
  • Limiting access points to work zones
  • Establishing pedestrian-free areas where possible
  • Establishing work zone layouts commensurate with type of equipment
  • Providing signs within the work zone to give guidance to pedestrians, equipment and trucks
  • Designing buffer spaces to protect pedestrians from errant vehicles or work zone equipment
ITCP Components

Notes Page
  • Safety Points
  • Personnel
  • Equipment
Legend
  • Method Specific
Work Area Diagrams
  • Dimensions Movement Flow
  • Workzone Limits
  • Signage
Internal Traffic Control Plan

Safety Points:
  • No workers in traffic zone
  • Spotter uses hands free radio to talk to trucks
  • No workers on foot between a backing truck and the paver
  • No rollers within 50 feet of the back of the paver
  • Inspectors remain away from paving train and notify spotter before obtaining samples
Symbols’ Legend




Paving Model Plan – Traffic Adjacent



Steps in Preparation of ITCPs
  • Review TCP (for Work Zones) and Other
  • Contract Documents
  • Determine Site Specific ITCP Needs
  • Draw Work Space
  • Add Pedestrian and Equipment Paths
  • Locate Staging Areas
  • Prepare Notes and Plan
Engineering Controls



Blind Spot Intervention Types
  • Backup alarms
  • Spotters
  • Visual Devices
  • Sensors/Parking Aids
  • Other/Hybrid devices
Evaluating Systems
Which work best for construction sites?

Preliminary test in parking lot.
  • Feasible to mount system on trucks?
  • Minimal false alarms?
  • Reliable detection of a person?
Long term test.
  • System evaluation forms
  • Driver interviews
  • First hand observations during ride-along
  • Winter and summer tests




Systems Selected for Long Term Tests with WSDOT


Radar Systems

Preview Preco Electronics


Guardian Alert


Camera Systems

Clarion heated camera




Intec camera


Ultrasonic System

Hindsight 20/20


Camera and Radar
Sanding Truck

Two systems selected for winter tests on a sanding truck:
  • Preco’s Preview radar
  • Clarion heated camera with shield
2 month test (Dec. – Jan.) in harsh conditions





Results:
  • Camera and radar effective in dry conditions
  • Problems in snow, rain:
    • Snow, ice, mud build-up after 5 miles
    • Camera lens shield froze then broke
    • Radar false alarms from snow and mud on antenna
  • Improvements needed!


Camera and Radar
Dump Truck
  • Camera and radar worked best when mounted high
  • Could not mount either system on the tailgate or hitch area
  • Designed bridge for mounting systems




Results:
  • Ride-along showed very few false alarms from radar, but camera more useful
  • Clearance problem with bridge under asphalt loading bins and wheeled loaders
  • Bridge won’t work - camera and radar must be mounted on dump box


Hindsight Sonar
Dump Truck





Results:
  • Drivers said system is reliable in most conditions
  • Concerned about detection range of 8 ft
  • Some false alarms in heavy dust
  • Constant false alarms when trailer is being pulled (optional trailer system needed)
  • Tests continue on smaller vehicles
Intec Camera System
Dump Truck
  • Small camera that can mount on side of dump box
  • Size of 2 inch cube


Results:
  • Small size allowed for good mounting location
  • Most drivers found it useful
  • Reliable operation during 5 month test
  • Would have problems in winter


Guardian Alert Radar System
Dump and Bridge Insp. Trucks









Results:
  • Small and easy to mount
  • Does not detect people very well
  • Good detection of other objects
Conclusions

Sensor systems (radar, sonar, infrared):
  • False alarms are possible
  • Nuisance alarms can be numerous in crowded work areas
Camera systems:
  • Provide view of blind area
  • Do not alarm so potential collision may go unnoticed
  • May not work in winter conditions
  • Good solution for crowded work zones during warmer months
A combination of sensors and a camera may be best solution for warmer months
  • Alarm prompts driver to check video
  • Video allows driver to check source of alarm
System Improvements

Previous test results prompted Preco to modify their radar system:
  • Smaller package
  • Ignores some mud/snow on sensor face
  • Tests on 3 dump trucks this spring


Intec developing new cameras for winter-time use:
  • Small, heated enclosure
  • Innovative methods to keep lens clean
  • Winter tests to be scheduled


New Ideas

The TagView™ System

How it Works
TagView ™ has three main components:
  • Small, low cost tags secured to each worker or embedded in an Electronic Guardrail ™ in the area to be monitored
  • Rugged reader units located on vehicles operating in the area
  • LCD displays located in the vehicle cabs

The reader emits an interrogation signal which is deted by any tags within range (typically 50 to 100 feet). The tags respond with predeterminied timing signals, which the reader interprets. The reader determines the distance to the closest tag, and a cabmounted display unit alerts the vehicle operator with visual and/or audible warnings. The cab display can be programmed with warnings and alerts which change appropriately with tag distance.

NIOSH Publication

Evaluation of Systems to Monitor Blind Areas Behind Trucks Used in Road Construction and Maintenance: Phase 1

www.cdc.gov/niosh

Any Questions???

bhammer@cdc.gov
(304) 285-6379

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