Temporary Traffic Control

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Temporary Traffic Control

• Data Collection
• by
• InTrans Staff Students

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Guidance for Safety

• Have copy of Manual on Uniform Traffic Control
  Devices for reference

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Be Properly Trained

• Iowa DOT Flagger Training
• Familiar with MUTCD and Iowa DOT Standard Road
  Plans
• When working in other states, ask about temporary
  traffic control requirements

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Procedures

• Call agency in charge in advance to advise of
  work and request traffic control
• Develop and use traffic control plan
• Wear ANSI Standard Class 2 Apparel as minimum.
  Class 3 is better
• Use proper advance warning signs
• Avoid peak traffic periods
• Visit site in advance to judge sight conditions
  and traffic volume
• Avoid locations with inadequate sight distance
  for on-coming traffic

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Select Proper Traffic Control

• MUTCD
• Iowa DOT Road Standards
• Work Zone Safety for Iowa
• Iowa DOT Flagger Handbook

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Iowa DOT Road Standards

• http//www.iowadot.gov/erl/current/RS/frames.htm

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MUTCD Guidance

• Part 6 Temporary Traffic Control

• Chapter 6A General
• Chapter 6B Fundamental Principles
• Chapter 6C Temporary Traffic Control Elements
• Chapter 6D Pedestrian and Worker Safety
• Chapter 6E Flagger Control
• Chapter 6F Temporary Traffic Control Zone
  Devices
• Chapter 6G Type of Temporary Traffic Control
  Zone Activities
• Chapter 6H Typical Applications
• Chapter 6I TTC in Incident Management Areas

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Chapter 6E Flagger Control

• 6E.01 Qualifications (Guidance Definitions)
• 6E.02 High-Visible Clothing (Standard)
• 6E.03 Hand-Signaling Devices (Paddle Flag)
  (Standard)
• 6E.04 Flagger Procedures (Standard)
• 6E.05 Flagger Stations
• Should be located so that an errant vehicle has
  room to stop without entering the work space
• SHALL be located so that approaching road users
  have distance to stop at the intended point.

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Section 6G.01

• Three major factors in selecting proper temporary
  traffic control
• Duration of activities
• Location of work
• Type of work
• Common sense and good judgment must be used in
  all situations

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Section 6G.02

• Short-duration work (less than an hour)
• May take longer to set up traffic control than to
  perform the work
• Set up can be hazardous and cause delays
• SO, simplified procedures may be warranted
• reduce number of devices (signs, etc.)
• supplement with use of proper warning lights on
  work vehicles
• same procedures may apply to mobile operations

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Factors in Traffic Control Selection

• Duration of activities
• Location to moving traffic
• Type of road
• Geometrics
• Alignment
• Intersections
• Traffic volumes
• Prevailing speeds
• Traffic mix
• Etc.

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Major Issue in all Situations

• VISIBILITY

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Chapter 6H Typical Applications

• Features
• Index
• Symbols
• 46 illustrations
• NOTES (many Standard statements)

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MUTCD
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Notes.

• For short-term, short-duration or mobile
  operations, all signs and channelizing devices
  may be eliminated if a vehicle with activated
  high-intensity rotating, flashing, oscillating,
  or strobe lights is used.
• Vehicle hazard warning lights may be used to
  supplement these lights, however
• Hazard warning lights shall not be used instead
  of MUTCD approved warning lights

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MUTCD Work on Shoulders, (may eliminate
signs, etc. for short duration work)
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MUTCD Shoulder work with Minor
encroachment (ok for low volume, low speed
roadways only, in other situations, close the
lane)
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MUTCD Self regulating traffic control (Use
only on low volume, low speed roadways where
drivers can see around the work)
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READ NOTES !!
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Notes for Figure 6H-16Typical Application
16Surveying Along Centerline of Low-Volume
RoadStandard5. For surveying on the centerline
of a high-volume road, one lane shall be closed
using the information illustrated in Figure
6H-10.Option6. A high-level warning device may
be used to protect a surveying device, such as a
target on atripod.7. Cones may be omitted for a
cross-section survey.8. ROAD WORK AHEAD signs
may be used in place of the SURVEY CREW AHEAD
signs.9. Flags may be used to call attention to
the advance warning signs.10. If the work is
along the shoulder, the flagger may be
omitted.11. For a survey along the edge of the
road or along the shoulder, cones may be placed
along theedge line.12. A BE PREPARED TO STOP
sign may be added to the sign series.Guidance13
. When used, the BE PREPARED TO STOP sign should
be located before the Flaggersymbol sign.Page
6H-36 December 2000Sect. 6H.01
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MUTCD Work in middle of the road
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USE OF ARROW PANEL
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MUTCD One or more flaggers may be required
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MUTCD Moving Operations
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Iowa DOT Road Standard, lt One Hour
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Iowa Work Zone Handbook
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Iowa DOT Road Standard 2 Lane Road
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Iowa DOT Road Standard 4 Lane Road
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Examples of Work Activities
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Use Advance Warning Signs
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Warning Light on Vehicle
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Watch for On-coming Traffic
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Work Area Protection
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Iowa DOT Maintenance Truck
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Wear Proper Apparel
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Caution with Moving Traffic
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Other safety tips

• Never turn your back on traffic
• Pay attention when your activities are focused on
  road (pulling up tape)
• Dont try to beat traffic when crossing road
• Notify supervisors of unsafe activities by
  colleagues (impacts your safety as well as
  potential liability)

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Other safety tips

• Plan out data collection before you go
• Correct safety equipment
• Correct data collection equipment
• Dont assume drivers will do the right thing
• Dont force drivers to do the right thing
• You will lose all contests with a motor vehicle
• You may be right but dead
• Notify supervisor if situation is different than
  expected and you need additional help

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For Additional Information, References, or
Training contact

• Tom McDonald, PE
• Safety Circuit Rider, InTrans
• 294-6384
• tmcdonal_at_iastate.edu

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Data collection tips in general
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Data collection

• Understand what you are collecting before you go
  and why
• What do the study protocols require (sample size,
  collection times, etc)
• Time of study (a peak hour study actually has to
  be done during peak hour)
• Whats the big picture
• If you are collecting data to determine the
  effectiveness of a device make sure the device is
  working
• Avoid making assumptions check if you need
  clarification
• If you have to make assumption, record what you
  did

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Data collection

• Use or make up data sheet to record all relevant
  information
• Time, date
• Weather
• road condition
• Location of data collection -use map
• Who collected data
• Problems
• Back-up files and hard copies
• More documentation is better than less

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Data collection

• Understand what you are collecting before you go
  and why
• What do the study protocols require (sample size,
  collection times, etc)
• Whats the big picture
• Avoid making assumptions check if you need
  clarification
• If you have to make assumption, record what you
  did