Title: Work Zone Best Practices
1Work Zone Best Practices
- A How To Workshop for Making Work Zones Work
Better. - Sponsored by
- Federal Highway Administration
- Office of Transportation Operations
- Washington, D.C.
- May 2001
2Purpose and Process
- Purpose
- Introduce The Work Zone Best Practices Guidebook
- Provide instruction in how to use the Guidebook
- Encourage use of the Guidebook
- Audience
- Practitioners involved in all phases of providing
our transportation network - Planning, operations, engineering, construction,
design, traffic control - Training Module
- Consists of 5 parts
3Overview
- Whats the Problem?
- Addressing the Problem FHWAs Work Zone
Mobility and Safety Program - Work Zone Best Practices Resources
- Work Zone Best Practices Applications
- How You Can Help!
4Why Do Work Zones Need To Work Better?
- Safety of workers and drivers
- Many serious injuries and fatalities result from
crashes in work zones - Mobility of the traveling public
- Travelers are frustrated with the of work zones
and the delays they cause - More population/drivers Limited new roads ?
More congestion - As the nation's highway infrastructure ages, more
rehabilitation is needed. - Aging infrastructure ? More rehabilitation ? More
work zones - Work zone mobility and safety have increasing
importance as work zones become more of a daily
fixture on our roads. - More work zones More congestion ? More delays
injuries/fatalities - Unless We MAKE WORK ZONES WORK BETTER
5Work Zones Can Be Dangerous
6Work Zone Safety Fact Sheet 1
- Fatality Data
- Over the last 5 years the number of persons
killed in motor vehicle crashes in work zones has
averaged more than 750 fatalities per year, with
a high of 868 in 1999. - In 1998, 772 fatalities resulted from motor
vehicle crashes in work zones, 222 of which
resulted from large truck crashes. - On average from 1994 to 1998, 16 of the
fatalities resulting from crashes in work zones
were non-motorists (pedestrians and bicyclists). - Injury Data
- In 1998, approximately 39,000 people were injured
as a result of motor vehicle crashes in work
zones 3,000 of those resulted from large truck
crashes.
7Work Zone Safety Fact Sheet 2
- When Crashes Occur (1998 data)
- More than half of all work zone crashes occurred
during the day, while about three-quarters of
fatal large truck work zone crashes were during
the day. - Almost three times as many work zone crashes
occurred on weekdays compared to weekends. - Fatal work zone crashes occurred most often in
the summer and the fall.
8Work Zone Safety Fact Sheet 3
- Where Crashes Occur (1998 data)
- Much higher of fatal work zone crashes occur on
urban interstates (14) than of all fatal
crashes occurring on urban interstates (6). - For fatal large truck crashes percentage of work
zone crashes occurring on urban interstates was
twice as high compared to all fatal truck crashes
(20 vs. 10). - Majority of fatal work zone crashes for all
vehicles (59) and large trucks (71) occurred on
roads with speed limits of 55 miles per hour or
greater.
9Work Zone Safety Fact Sheet 4
- Types of Crashes (1998 data)
- Significantly higher percentage of fatal work
zone crashes are rear-end collisions (31) than
in all two-vehicle fatal crashes (12)
10Road Construction Hazards Fact Sheet
- For Laborers International Union of North
America (LIUNA) members, employment in road
construction is hazardous - - 38 of members are employed in road construction
activities, yet over 73 of on-the-job fatalities
occurred in road and highway construction - Highway and street construction activities (SIC
1611) are among the most hazardous - fatality
rate for highway construction workers is double
the rate for other construction - In the U.S., 120 to 130 workers die per year in
road construction activities. Over 62 of the
fatalities are not directly related to traffic
issues.
11Work Zone Mobility Fact Sheet 1
- More Construction Projects ? More Work Zones
- Since 1981, highway spending has grown 50.2
- Over the duration of the Transportation Equity
Act for the 21st Century (TEA-21), funding levels
for highway construction will increase nearly 40
- In 1997, 47.6 was spent on system preservation
(resurfacing, restoration, rehabilitation,
reconstruction). - As our highway system continues to age, more will
be needed.
12More Work Zones
- 160,000 miles of National Highway System and
300,000 miles of arterials reaching middle age - 1.4B infrastructure value increased
preservation work is needed
13Work Zone Mobility Fact Sheet 2
- More Traffic ? More Congestion
- Congestion has been projected to increase by 50
in the next 10 years
14Traffic is Growing
- The 1999 Conditions and Performance Report
(CPR) shows increasing trends in both highway
vehicle miles traveled (VMT) and Interstate daily
VMT over a 10 year period.
- Were traveling more miles without increasing
highway capacity significantly. - Urban VMT and DVMT per lane-mile are growing
faster than on rural highways.
15Congestion is Growing
- According to the 1999 CPR, the percentage of
highway miles considered extremely or
severely congested more than doubled between
1982 and 1997. - The percentage uncongested highway miles fell
by almost half during the same period.
16Work Zone Mobility Fact Sheet 3
- More Congestion More Work Zones ? More Delay
?Driver Frustration - In a 1995 NQI survey, only 29 of respondents
were satisfied with traffic flow through work
zones delays caused by construction received the
lowest overall satisfaction rating. - In the 2000 Omnibus Traveler Survey, the top
reason cited for delays was heavy traffic,
followed by road work.
17Work Zone Mobility Fact Sheet 4
- More Congestion More Work Zones ? More Delay
?More - Work Zone Delay Costs Daily road user delay
costs on many urban freeway reconstruction
projects have been calculated to be over 50,000
per day.
18Overall Congestion Costs
- A recent Texas Transportation Institute (TTI)
study estimates the cost of congestion (in
constant 1997 dollars) to have grown from 21B in
1982 to 72B in 1997.
19Work Zones . . .
- Take the roadway out of service
- Impact people and businesses
- Create frustration!
20Consider Running a Factory
- The factory is profitable only when it is
producing - Need to minimize equipment down time to
maximize profitability - What do you do to keep it producing?
- Better equipment with fewer repairs
- Fast maintenance procedures
- Well-trained staff
- Redundant equipment
- Outsourcing options
- Contingency plans
21Consider Our Transportation System as a Factory
- The Transportation System is part of the
equipment that keeps the factory producing. - It only makes money (or supports quality of life)
when its producing. - We need to minimize down time of the system.
- What do we do to keep our transportation system
producing? - Better materials that last longer
- Faster maintenance
- Better methods
- Alternate routes/modes to keep it running (moving
people and goods) - Good planning
22Just as the cost of downtime is real to the
factory
- The cost of transportation system down time due
to work zones is real to our users.
23Mobility Safety
- Mobility and Safety are closely tied
- As congestion builds, crash rates increase.
- As crashes increase, more congestion occurs.
24Why We Need Work Zones To Work Better
-
- More delays injuries/fatalities
- UNLESS
- WORK ZONES WORK BETTER
More work zones
More congestion
25Work Zone Observations
- Most senior State and local transportation
officials are keenly aware of the delays and
economic impacts caused by work zones, but their
philosophy has not been formally documented in
policy statements and/or performance goals nor
is this awareness ingrained in the culture of the
agencies. - All of the State and local transportation
agencies recognize that completing the work
safely is of utmost importance. - Most States and local transportation agencies
recognize the value of employing traffic
management principles. However, their
application has been limited to large high
visibility projects. - Although a few transportation agencies have begun
to implement corridor management techniques,
corridor traffic management is still in its
infancy.
From Meeting the Customers Needs for Mobility
and Safety During Construction and Maintenance
Operations, Federal Highway Administration, 1998.
26Work Zone Observations (contd)
- Some States utilize cross-cutting teams and
proactively seek input from external stakeholders
in the development of the project traffic
management plan. - Traditional bidding procedures do not reward or
encourage contractors to produce higher quality
work and/or expedite completion of the work. - Traditional traffic control practices do not
encourage the contractors to minimize motorist
delay and/or enhance the safety of the work zone. - Prediction models are available however, current
usage is generally limited to large highly
visible projects. - There is a compelling need for a comprehensive
effort to educate the general public, road users,
and elected officials on the need for work zones,
how to navigate safely through a work zone, and
the dangers associated with them.
27Work Zone Observations (contd)
- All transportation agencies are experiencing
customers increasing demand for accurate real
time information. Most State DOTs are meeting
their customers needs on high impact projects
however, a few agencies have expanded their
program to include all projects. - There is universal agreement that the most
effective way of controlling speed in the work
zone is to have a staffed police car with
flashing lights at the beginning of the work
zone. - ITS technology has not been adapted/applied into
work zone traffic management. - There is a compelling need for accurate work zone
crash data and the evaluation of traffic handling
techniques in order to make sound decisions.
28Overview
- Whats the Problem?
- Addressing the Problem FHWAs Work Zone
Mobility and Safety Program - Work Zone Best Practices Resources
- Work Zone Best Practices Applications
- How You Can Help!
29The Opportunity to Make Work Zones Work Better
- We have
- Improved construction materials and processes
- New opportunities provided by technology
- Public frustration that creates political will
and increased acceptance of innovative processes - Greater means of sharing information about new
materials and processes and technologies - Internet/Web sites
- Conferences/workshops
- Peer-to-peer dialogue
- FHWAs Work Zone Mobility and Safety Program
- The Work Zone Best Practices Guidebook
30A National Agenda to Address the Impacts of Work
Zones
- Maximize availability of transportation network
- Minimize user impacts
31National Work Zone Mobility and Safety Vision and
Goal
- National Work Zone Vision
- Maximize availability of the transportation
network through traveler-focused system
management that maximizes safety and minimizes
delays due to work zones. - Plan and conduct maintenance and improvements to
the network in ways that minimize impacts to
traffic flow and risks to road users and workers
using a full life-cycle perspective. - National Work Zone Goal
- Minimize impacts on user mobility and safety and
worker safety due to work zones
32A National FrameworkMaking Work Zones Work
Better
Transportation Planning
Continuously Track and Analyze Work Zone
Performance
Managing Traffic During Work Zones
Project Design for Construction and Maintenance
Traffic Control Planning
33National Framework ? FHWA Program
- FHWA Program Objectives
- Develop national performance measures
- Track performance measures over time
- Increase use of performance measures
34National Framework ? FHWA Program
- FHWA Program Objectives
- Make work zone considerations a routine part of
transportation planning - Institutionalize consideration of user impacts
over the life cycle - Promote corridor/network management perspective
35National Framework ? FHWA Program
- FHWA Program Objectives
- Reduce construction duration (e.g., use of
time-conscious construction methods) - Increase use of innovative contracting techniques
- Ensure safe working environment
- Increase life cycle (more durable, higher quality
projects)
36National Framework ? FHWA Program
- FHWA Program Objectives
- Improve traffic control plans
- Assess safety impacts of TCPs on workers
37National Framework ? FHWA Program
- FHWA Program Objectives
- Maximize worker and road user safety during WZ
- Facilitate use of real-time WZ management to
minimize delay - Better inform and involve the public
- Encourage prompt, effective incident response
38The Three Ds
- Durability, Duration, Density
- Facility Durability - Reduce the of work zones
Reduce the need for work zones through the use of
improved materials and methods that increase the
life cycle. - Project Duration - Reduce the time a work zone is
in place Reduce construction time in the roadway
through better methods, policies, technologies,
and operations. - Traffic Density - Improve traffic flow in and
around those work zones that must occur Decrease
traveler delay and safety impacts due to work
zones through better TDM, traveler information,
traffic control, incident response, and work zone
geometry.
39Making Work Zones Work Better and Best Practices
- Work zone operations managers and operators
realize distinct benefits from being aware of
the current best practices available nationally. - Solutions come from partners working together
successfully to solve problems within the
resources, authority, and relationships available
to them. - We can learn from the successes of federal,
state, and local agencies and private sector
partners working to improve mobility and safety
on both sides of the barrel.
40FHWA Work Zone Mobility and Safety Program
41Overview
- Whats the Problem?
- Addressing the Problem FHWAs Work Zone Mobility
and Safety Program - Work Zone Best Practices Resources
- Work Zone Best Practices Applications
- How You Can Help!
42FHWA Work Zone Best Practices Resources
43Work Zone Best Practices Guidebook
- Overview of the Guidebook
- How the Guidebook is Organized
- Guidebook Maintenance/Updates
- State-of-the-Art Work Zone Mobility and Safety
Practices
44Work Zone Best Practices Guidebook
- Based on 1998 scanning tour of 26 states where
work zone best practices were identified - Collaboration between FHWA and AASHTO Work Zone
Best Practices Task Force - Includes cross-references and topical index
- Describes state-of-the-art practice as well as
262 specific best practices - Contains points of contact
- Will be updated as the state-of-the-practice
evolves
45Work Zone Best Practices Guidebook
- Overview of the Guidebook
- How the Guidebook is Organized
- Guidebook Maintenance/Updates
- State-of-the-Art Work Zone Mobility and Safety
Approaches
46Guidebook Organization
- Best Practices are presented in 11 Best Practice
Areas - To facilitate finding applicable practices, the
Best Practices are also sorted into - 7 Cross-Reference lists
- A Topical Index of 41 topics and subtopics
47Work Zone Best Practices Guidebook Structure
48Best Practices Information
- Each Best Practice Area begins with the
State-of-the-Art - Description of the state-of-the-art
- List of enabling objectives what transportation
agencies/practitioners would need to do to
achieve the state-of-the-art - Next is a list of the specific best practices for
that best practice area - List organizes the practices into more specific
subcategories
49Best Practices Information (cont.)
- For each Best Practice, the Guidebook provides
- Reference number used in the cross-reference
section - Location where the practice/policy/technology was
used - Title of the Best Practice
- Description
- Reason(s) for adopting the practice/policy/technol
ogy - Biggest benefit(s) realized from the Best
Practice - Location and type(s) of projects where the Best
Practice is most applicable/effective - Contact(s)
50Work Zone Best Practices Guidebook
- Overview of the Guidebook
- How the Guidebook is Organized
- Guidebook Maintenance/Updates
- State-of-the-Art Work Zone Mobility and Safety
Approaches
51FHWA/AASHTO Partnership for Maintaining the Work
Zone Best Practices Guidebook
- AASHTO
- Access to Practitioners and Vendors
- Hands-on Experience and Activities
- Subject Matter Expertise
- Distribution Channels
- FHWA
- National Coordination
- Program Planning and Management
- Headquarters and Field resources
- Publication and Production Support
52Role of the AASHTO Work Zone Technical Team in
Maintaining the Guidebook
- Review Current Content - Updates
- Review Guidebook content for accuracy, quality,
completeness, and usefulness and recommend
modifications, deletions, corrections. - Review Guidebook media, format, and organization
and recommend improvements that will improve
access and utility. - Recommend Future Content - Updates
- Identify and contribute new best practices to be
added to the Guidebook. - Assist in soliciting new best practices from
practitioners, developers, vendors, and system
users. - Review best practices submissions and select
those which are to be included in future editions
of the Guidebook. - Outreach
- Help publicize the Work Zone Best Practices
Guidebook through professional organizations,
presentations at technical meetings, professional
and trade publications and other venues and
outlets. - Participate in Work Zone Best Practices Workshops
as speakers, panelists, and participants.
53Best Practices Guidebook Update Process
54Work Zone Best Practices Guidebook
- Overview of the Guidebook
- How the Guidebook is Organized
- Guidebook Maintenance/Updates
- State-of-the-Art Work Zone Mobility and Safety
Approaches
55State-of-the-Art Work Zone Practices
- Policy and Procedure
- Decisions are based upon a customer driven
comprehensive work zone traffic management policy
that focuses on reducing the exposure of the road
user and worker. - Policy addresses high-quality design,
construction, and maintenance operations,
minimizing disruption to the highway user and
maintaining a safe, efficient roadway environment
for the traveling public and the highway worker.
- The organizational structure fully supports
cross-cutting teams in all phases of work zone
traffic management where capacity reductions
adversely impact traffic flow. - Public Relations, Education, and Outreach
(General Public, Driver, and Elected Officials) - The driving community and elected officials are
informed, involved, and sensitive to the highway
worker and work site safety needs.
From Meeting the Customers Needs for Mobility
and Safety During Construction and Maintenance
Operations, Federal Highway Administration, 1998.
56State-of-the-Art Work Zone Practices (cont.)
- Prediction Modeling and Impact Analysis
Congestion and Crashes - Available predication/analysis tools are
user-friendly and readily adapted to the local
construction site and situation. - These tools can accurately analyze and reliably
predict congestion situations including travel
times, queue length, travel speed, total delay,
crash rates, severity levels, and interactive
feedback to both the design and construction
team. - Planning and Programming
- A corridor approach is used in evaluating,
planning, and programming. - This process gives full consideration to
long-range corridor needs, traffic demands,
road-user costs, potential business community
impacts, use of extended designs and
high-performance material, and overall evaluation
of total costs for the life of the improvement.
57State-of-the-Art Work Zone Practices (cont.)
- Project Development/Design
- Motorist delay, road user and worker safety, and
impacts to adjacent communities are assessed on
all major urban and other high volume corridors.
- Cross-cutting teams and multi-agency/interests
are used in developing alternatives and selecting
the preferred design that minimizes present and
future exposure to road users and workers. - The project development process results in a TCP
that provides for shared risk and benefits for
owners, contractors, and traveling public. - Contract times and motorist delays are minimized
through the use of CPM scheduling and accelerated
contracting procedures. - Contracting and Bidding Procedures
- Contracting and bidding procedures reward
contractors for quality work, innovation,
accelerated early completions, minimizing
motorists delays, and enhancing the safety of
road-users and workers. - On high-risk, high-visibility, and complex
projects contractors are pre-qualified on the
basis of quality and past performance.
58State-of-the-Art Work Zone Practices (cont.)
- Specifications and Construction Materials,
Methods, and Practices - The same level of service is provided through the
work zone. - Workers are physically separated and are
protected from the traffic. - Work areas are sufficiently illuminated at night
without blinding the motorist and gawk screens
are used to prevent the motorists from being
distracted during daytime operations. - Contractors have a vested interest in quality,
timeliness, and road-user safety. - Facilities perform at an acceptable level of
service for 35-50 years with the minimum planned
systems preservation. - Acceptance is based on performance.
- Traveler and Traffic Information (Project
Related) - Accurate real-time work zone (construction/mainten
ance/utility operations) information is provided
to the road users in sufficient time to make
informed travel decisions.
59State-of-the-Art Work Zone Practices (cont.)
- Enforcement
- Work zone trained and qualified, full-time
uniformed police officers are readily available
for construction and maintenance operations. - State-of-the-art technology is used to maximize
effectiveness of these police officers. - ITS and Innovative Technology
- The ITS systems are used to automatically collect
and analyze before, during, and after traffic
flows in the work zones provide accurate
real-time information automatically to motorists
and to the construction team enforce speed as
well as safely guide motorists through the work
zone.
60State-of-the-Art Work Zone Practices (cont.)
- Evaluation and Feedback
- Uniform work zone crash data is collected
electronically in all States and the raw data is
simultaneously transmitted to the State DOT. - Work zone crash data is automatically analyzed
and trends and reports are periodically furnished
to appropriate DOT offices (including, but not
limited to, design and construction project
personnel). - Performance measures for work zone
congestion/delay are used to evaluate how well
agencies are meeting performance goals for
mobility and safety in work zones. - Motorists provide perspectives on how well their
demands for mobility and safety in work zone are
being met.
61Overview
- Whats the Problem?
- Addressing the Problem FHWAs Work Zone
Mobility and Safety Program - Work Zone Best Practices Resources
- Work Zone Best Practices Applications
- How You Can Help!
62Work Zone Best Practices Application
- How to Use the Guidebook to Find Best Practices -
An Application Framework - Practice Applications of Work Zone Best Practices
63Work Zone Best Practices Checklist
64Density How can we reduce the delay caused by
the work zone?
Facility Life Cycle
Construction
Design
Planning
Policy
Work Zone Impact Area
- Operations (traffic mgmt)
- Work Scheduling
- TDM
- Queues
- Delays
- Enforcement
- Implementation
- Modeling and analysis/ Metrics
- TCPs
- Enforce-ment
- ATIS
- PTMS
- Incentives (traffic delays)
- TMPs
- Expectations/goals
- Metrics
- Corridor management
- Maximum delay policies
- Enforce-ment
- Safety
Traffic Density
Duration
Durability
65Duration How can we minimize the time it takes
to build a project?
66Durability Can we reduce the need for a work
zone?
67Work Zone Best Practices Application
- How to Use the Guidebook to Find Best Practices -
An Application Framework - Practice Applications of Work Zone Best Practices
68Sample Problem 1 Bridge Rehabilitation
- Project Description
- A bridge with two separate structures (one for
eastbound traffic and one for westbound traffic)
carries about 43,000 vehicles a day on average,
over a river to and from the downtown of a
mid-size city. Each structure has 3 lanes. - Work involved the eastbound structure and would
consist of removing and replacing the bridge
deck, removing and replacing the structural steel
flooring system, and blasting and painting the
entire structure. - Past work on or near the bridge has resulted in
30-minute traffic delays. - Develop a plan for construction and traffic
management. - Eastbound structure needs to be closed for most
of the project. - What best practices can be used to enhance
mobility and safety in the work zone? - How can the Best Practices Guidebook be used to
help?
69Response for Sample Problem 1
- Use the Cross-Reference Lists in the Guidebook
- Nature of Work ?Bridge Repair, Bridge Maintenance
- BP 30 - Use of commuter incentives to minimize
congestion in work zones - BP 116 - Contractor hired by design consultant
to do constructability review on bridge (AB
bidding) - BP 135 - Contract award of Interstate bridge
repair project based on performance and cost - Project Life Cycle Stage ? most categories,
including Traffic Control, Traffic
Control/Management Plans - BP 5 - Traffic management plan on major urban
project - BP 95 - Traffic Management Workgroups
- Roadway Characteristics ? Multi-lane, Divided
Facilities - BP 75 - Promotion of AB bidding lane rentals,
incentives/disincentives, PR campaign - BP 90 - High Impact Project Task Forces
70Response for Sample Problem 1 (cont.)
- Use the Search Feature of the Guidebook CD to
find some potential best practices - Search on bridge
- BP 61 - Multi-jurisdiction TCP and public
outreach for bridge closure project - BP 94 - Use of a Steering Committee
- BP 121 - Summertime Bridge Reconstruction
Program - Search on lane closure
71Response for Sample Problem 1 (cont.)
- Use the Topical Index
- Community Involvement
- Education/Outreach
- Innovative Contracting
- Public Relations
- Traffic Management Technologies
- Traffic Management/Control
- Traveler Information
- Real-Time Traveler Information BP 221 -
ADAPTIR - Work Zone Lane Management
- Worker Safety
72Response for Sample Problem 1 (cont.)
- Using a combination of
- A movable barrier - The westbound structure
carried two-way traffic using a reversible middle
lane. A movable concrete barrier was moved twice
daily to make 2 lanes of travel for peak hour
traffic flow direction - Traffic management system with real-time
information - AB bidding
- Being proactive in working with local officials
and the media - An innovative overhead crane system to facilitate
placement of the new bridge deck and movement of
materials - Traffic delays and frustration were reduced
- The media was waiting for traffic to back up and
it didnt. - No one could believe how smoothly traffic flowed
because of the past history of backups on the
bridge.
73Sample Problem 2 Interstate Highway
Reconstruction
- Project Description
- Resurfacing and reconstruction of underlying
roadbed, safety upgrades, major bridge
rehabilitation, and drainage improvements are
needed. - Roadbed is almost 30 years old and needs serious
safety improvements and repairs. 70 of the
joints in the sections that will be replaced have
failed or need repair, on-ramps and bridges need
structural or safety improvements. - Project will include northbound and southbound
lanes each direction has 2 lanes. - Develop a plan for construction and traffic
management What best practices can be used to
enhance mobility and safety in the work zone? -
- How can the Best Practices Guidebook be used to
help?
74Response for Sample Problem 2
- A combination of
- Extensive planning
- Widespread community involvement
- Project phasing
- Total road closure strategy
- Year-long information campaign to alert the
public to alternate ways to travel (mode and
route) - Alternate routes (make improvements on them,
encourage use) - Increased use of public transit (new routes,
publicity) - Were used to obtain
- The shortest reasonable construction period
- At the least expense
- With a minimum of construction disruptions
- All work was completed on-time or faster than
planned
75Overview
- Whats the Problem?
- Addressing the Problem FHWAs Work Zone
Mobility and Safety Program - Work Zone Best Practices Resources
- Work Zone Best Practices Applications
- How You Can Help!
76How You Can Help!
- Register to receive notice of Guidebook updates.
- Use the best practices to plan, implement, and
operate highway work zones. - Seek advice from individuals with experience and
expertise. - Submit good ideas and best practices for work
zone mobility and safety. - Provide feedback on whats working and whats not
working. - Let FHWA know where you think additional research
and development work is needed.
77Useful Work Zone Web Sites
- FHWA Office of Operations Work Zone Mobility and
Safety Web Site - http//www.ops.fhwa.dot.gov/wz/workzone.htm
- FHWA Office of Safety Web Site Work Zone
Information - http//safety.fhwa.dot.gov/programs/wsz.htm
- FHWA National Work Zone Awareness Week Web Site
- http//safety.fhwa.dot.gov/fourthlevel/nwzaw01.htm
- National Work Zone Safety Information
Clearinghouse - http//wzsafety.tamu.edu