January/February
2002
Recent
Publications
Compiled
by Zac Ellis of FHWA's Office of Research and Technology Services
Below
are brief descriptions of reports recently published by the Federal
Highway Administration's (FHWA) Office of Research, Development, and
Technology. All of the publications are available from the National
Technical Information Service (NTIS). In some cases, limited copies
of the publication are available from the Research and Technology
(R&T) Report Center.
When ordering from NTIS, include the NTIS PB number (or publication
number) and the publication title. You may also visit the NTIS Web
site at www.ntis.gov to order publications online. Call NTIS for current
prices. For customers outside the United States, Canada, and Mexico,
the cost is usually double the listed price. Address requests to:
National
Technical Information Service
5285 Port Royal Road
Springfield, VA 22161
Telephone: (703) 605-6000
Toll-free number: (800) 553-NTIS (6847)
Expanded Sales Desk Hours: 8 a.m. to 8 p.m. EST, Mon.-Fri.
Requests for items available from the R&T Report Center should
be addressed to:
R&T Report Center, HRTS-03
Federal Highway Administration
9701 Philadelphia Court, Unit Q
Lanham, MD 20706
Telephone: (301) 577-0906
Fax: (301) 577-1421
For
more information on research and technology publications coming from
FHWA, visit the Turner-Fairbank Highway Research Center's (TFHRC)
Web site at www.tfhrc.gov, FHWA's
Web site at www.fhwa.dot.gov,
the National Transportation Library's Web site at http://ntl.bts.gov,
or the OneDOT information network at http://isweb.tasc.dot.gov/library/library.htm.
Highway
Design Handbook for Older Drivers and Pedestrians
Publication No. FHWA-RD-01-103
This
project updated, revised, and expanded the scope of the Older Driver
Highway Design Handbook published by FHWA in 1998. The resulting document
incorporates new research findings and technical developments; extensive
feedback from state, county, and municipal engineers who reviewed
and applied recommendations from the earlier version of the handbook;
and recommendations with supporting background material for aspects
of modern roundabouts and highway-rail grade crossings, two elements
that were not covered in the 1998 publication. Recommendations geared
toward the use of highway facilities by pedestrians also receive greater
emphasis. Guidance on how and when to implement the recommendations
has been added, as well as codes that indicate at a glance the relationship
of each recommendation with standard design manuals, including the
Manual on Uniform Traffic Control Devices (MUTCD) and the American
Association of State Highway and Transportation Officials (AASHTO)
A Policy on Geometric Design of Highways and Streets (also known as
the "Green Book").
Development
of the updated handbook was complemented in this project by a technology
transfer initiative to make practitioners aware of the handbook and
to assist in applying its recommendations. This included the development
of a condensed document, Guidelines and Recommendations to Accommodate
Older Drivers and Pedestrians (Publication No. FHWA-RD-01-051), plus
printed and electronic materials supporting practitioner workshops
throughout the United States in the 1999-2001 period.
The NTIS
publication number is PB 2002-100276.
Guidelines
and Recommendations to Accommodate Older Drivers and Pedestrians
Publication No. FHWA-RD-01-051
Consistent
with the full handbook, this guidelines and recommendations document
incorporates new research findings, technical developments, and extensive
feedback from state, county, and municipal engineers who reviewed
and applied recommendations from the 1998 publication. Guidance on
how and when to implement the included recommendations is included,
as well as codes that indicate at a glance the relationship of each
recommendation to standard design manuals, including the Manual on
Uniform Traffic Control Devices (MUTCD) and the American Association
of State Highway and Transportation Officials (AASHTO) A Policy on
Geometric Design of Highways and Streets (also known as the "Green
Book").
All research
products developed under this contract are designed to provide practical
guidance to engineers for accommodating the needs and functional limitations
of an aging population of road users. Included recommendations are
directed toward new construction, reconstruction, scheduled maintenance,
and "spot treatments" to ameliorate demonstrated safety
problems, emphasizing countermeasures with modest additional cost
during installation and the potential for cost-savings over the entire
life cycle.
The NTIS
publication number is PB 2001-108785.
Prediction
of Chloride Penetration in Concrete
Publication No. FHWA-RD-00-142
The
objective of this study was to identify or develop a test for predicting
chloride penetration in concrete to be used for evaluating new mixes,
for accepting or rejecting new concrete according to specifications,
and for evaluating in-place concrete. The test was intended to supplement
or replace the use of AASHTO T27-93, "Electrical Indication of
Concrete's Ability to Resist Chloride." In this study, different
test procedures were evaluated for use in predicting the chloride
penetration resistance of concrete in a short time frame (less than
35 days). The test results were correlated to those of long-term salt
ponding and diffusion tests.
In the
first phase, several tests identified in the literature were subjected
to a preliminary screening process. In the second phase, tests identified
as promising were subjected to a more rigorous evaluation. In the
third phase, the best test procedure was examined further. As a result
of this work, the Rapid Migration Test (RMT) was identified as being
the most successful. RMT involves using an electrical potential to
drive chloride ions into a concrete sample for a specific test duration
and then evaluating the depth of chloride penetration with a colorimetric
indicator. RMT correlates as well or better than AASHTO T277 with
the long-term ponding tests and was able to evaluate correctly a wider
variety of concretes, including those with corrosion inhibitors. The
quantitative parameter obtained in RMT was related to those from AASHTO
T277 in the high-performance concrete grades identified by Goodspeed,
Vanikar, and Cook (1996). As part of this work, an inter-laboratory
evaluation was performed to assess RMT and to refine the procedure.
The NTIS publication number is PB 2002-100056.
Framework
for Evaluating the Use of Recycled Materials in the Highway Environment
Publication No. FHWA-RD-00-140
This
manual is intended as a reference document for highway and environmental
engineers who are interested in the use of recycled materials in the
highway environment. The document provides a recommended evaluation
methodology for determining the suitability of using recycled materials
in highway construction.
The methodology
is presented in hierarchical form, where more general evaluations
or screenings occur in the initial steps of the evaluation, followed
by more detailed laboratory and field testing, if needed, as the evaluation
proceeds. Detailed tables describing recommended testing methods and
criteria to be used in the evaluation are provided.
The NTIS
publication number is PB 2002-100893.
No
Wonder Congestion Continues to Grow
The
Bureau of Transportation Statistics is the source of all cited
statistics.
Virtually
every motor vehicle driver and passenger in the United States
knows that congestion is an ever-increasing problem despite
the Herculean efforts of the Federal Highway Administration,
state departments of transportation, local governments, and
others to find and implement solutions. Lots is being done,
but when you look at some of the relevant statistics, the incredible
magnitude of the problem becomes clearer.
First
of all, the United States has experienced a real population
explosion over the past 30 years. From 1970 to 1998, the resident
population of the country has increased from almost 204 million
to more than 270 million - an increase of 33 percent. And even
more astounding is the increase in the number of people in the
civilian labor force over the same period; the number has grown
from about 83 million to about 138 million, which is an increase
of 66 percent. So, by percentage, the work force has expanded
twice as much as the general population.
That's
55 million more people going to work daily, and because almost
88 percent of all workers travel to work in an automobile -
more than 78 percent drive themselves and about 9.5 percent
drive/ride in a car pool - that's about 48.4 million more commuters
by automobile on road every day.
Where
did all these people come from? Of course, part of the answer
is the overall increase in the adult population, and another
significant part of the answer is the more than 30 percent increase
in the percentage of women who are in the labor force.
This
is also reflected in the number of vehicles per household. In
1969, 21 percent of all households had no vehicle; by 1995,
only 8 percent were without a vehicle. During the same period,
the percentage of households that had only one vehicle dropped
from 48 to 32, while the percentage with two or more vehicles
increased from 31 to 59.
And
with the increases in the number of vehicles, the length of
commuter and personal trips, and commercial vehicle traffic,
the total highway vehicle-miles increased by 137 percent from
1970 to 1998 (by 72 percent from1980 to 1998). But from 1980
to 1999, the total U.S. roadway lane-miles increased by only
3.6 percent.
No
wonder that our roads are congested.
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Other
Articles in this issue:
A
Report of the National Highway R&T Partnership Initiative
Managing
Traffic Flow Through Signal Timing
Lessons
Learned About Bridges From Earthquake in Taiwan
An
Olympic Event: Handling Transportation During the Olympics
A
Legacy in Art in a New Exhibition
FHWA
and Nevada DOT Create a Wetland in Nevada
It's
the Ride That Count$