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198
g. Operates on a fully IBM-compatible microcomputer
at a reasonable speed and with a manageable amount of
input data.
h. Is written in user-friendly terms for use by a highway
hydraulics engineer.
i. Includes an option that accepts user-provided sedi-
ment and hydraulic resistance functions.
Task 4 Make sensitivity analyses and develop
guidelines for calibrating the model with emphasis on the
most important data needs for calibration.
Task 5 Test and demonstrate the adequacy of the
model by comparing the predicted results to measured
field data.
Task 6 Conduct a 2-day critique workshop for 10
highway hydraulic engineers.
Task 7- Prepare the final report documenting the
research effort, including a user's manual and a program
documentation manual.
Tasks 1 and 2 are comlete. Work on the computer
program progresses under Task 3. To accomplish Tasks
4 and 5, the agency is also in search of case studies and
field data.
Project 15-12 FY,88
Roadway Widths for Low Traffic Volume
Roads
Research Agency: In developmental stage
Principal Invest.:
Elective Date: (~30 months)
Completion Date:
Funds: $250,000
The objectives of this research are to develop an en-
gineering analysis procedure for determining roadway
width for the construction and reconstruction of low vol-
ume roadways (less than 2,000 ADT) and, based on this
analysis, to develop "minimum width of traveled way and
shoulder" recommendations for consideration by the
Geometric Design Task Force of the AASHTO Highway
Subcommittee on Design for inclusion in future editions
of the Greenbook.
This project will consist of at least six tasks as follows:
Task 1. Conduct a critical review of all pertinent
literature dealing with safety, operations, and geometries
of low volume roads as they pertain to and impact on
roadway width.
Task 2. Based on the results of Task 1, develop a
data collection and analysis plan for acquiring the ad-
ditional data needed to accomplish the project objectives.
Variables to be included in this analysis shall include but
not be limited to traffic volume, vehicle speed, percent
trucks, geometries, roadway functional classification (ar-
terial, collector, and local), level of service (Reference:
Greenbook, Table II-6, p. 96), traffic accident data, and
associated costs (i.e., traffic accident and roadway con-
struction, renovation, and maintenance). Prepare and dis-
tribute to the NCHRP Project Panel an interim report
describing the results of this task.
Task 3. Implement the plan developed in Task 2.
Task 4. Based on the analysis of information obtained
in previous tasks, develop an engineering analysis pro-
cedure for determining roadway width for roadways with
an ADT of less than 2,000. This procedure shall incor-
porate an optimization of the costs and safety benefits for
various roadway widths. Using the engineering analysis
procedure, develop recommended roadway widths related
to site conditions. It is anticipated that the traffic volume
variable will require a minimum of three categories below
2,000 ADT. Prepare and distribute to the NCHRP Project
Panel an interim report describing the results of this task.
Task 5. Apply the recommended roadway widths
developed in Task 4 and the current width criteria found
in the Greenbook to low traffic volume roadways con-
structed or reconstructed in three states and two counties
during the last 5 years. The states and counties will be
selected by NCHRP. Based on this analysis, determine
the number of additional miles of roadway that could
have been constructed or reconstructed in these 5 juris-
dictions using the recommended roadway widths. In ad-
dition, determine the associated safety impact of applying
the recommended roadway widths.
Task 6. Prepare a final report documenting the re-
sults of Task 1 through Task 5.
AREA 16. ROADSIDE DEVELOPMENT
Project 16-1 FY '66
Effects of Deicing Compounds on Vegetation
and Water Supplies
Research Agency:
Principal Invest.:
Elective Date:
Completion Date:
Funds:
Virginia Polytechnic Institute
Dr. R. E. Blaser
March 1, 1966
April 30, 1972
$217,300
The objectives of this study were to identify the det-
rimental effects of deicing salts on roadside vegetation
and water supplies and to seek means for counteracting
these detrimental effects.
The first phase of the study was an extensive literature
review and survey of experience with regard to deicing
salt use on roadways and the effects of this use on roadside
vegetation, water, and wildlife. It also included identifi-
cation of research needs in this problem area. This was
followed by an experimental program covering the actual
effects of deicing salts on specific types and~species of
vegetation and on soils along highways. Efforts were made
to evaluate methods of counteracting certain detrimental
effects.
Representative terms from entire chapter:
traffic volume
