http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Evaluation of alternative superelevation distribution methods
viii, 77 leaves : illustrations ; 28 cm.
adequate side friction demand for the majority of
amount of supererogation that is used on each
characteristics have greatly evolved. This thesis
characteristics of these methods. These methodologies
demand below the maximals comfortable side friction
distribution methods recommended in, 4 Policy on
documents an evaluation of the two supererogation
driver expectancy, adequate side friction demand
drivers with positive side friction. The results of
drivers. Additionally, Method 5 provides side friction
drivers. The results indicated that Method 2 provides
evaluation was on predicting the portion of the driver
experiencing negative side friction decreases with
experiencing negative side friction increases with
fast and slow driver in curve design. Also, Method 5
found that Method 5 fails to provide the majority of
Geometric Design of Highways and streets (i.e.,
horizontal curve. The supererogation distribution
increasing 95th percentile speed of the facility.
increasing curve radius. Also, the portion of drivers
is needed to improve current design standards.
limit for a majority of the drivers. However, it was
methodologies currently used in the United States do
Methods 2 and 5, J). Specifically, the focus of this
not provide a clear understanding of the operational
population experiencing adequate side friction demand
Recommendations include investigating crashes related
should be lower than the comfortable limit and higher
should be modified to consider the 5th percentile
Since then, roadway, pavement, and vehicle
Superelevation distribution methods determine the
than zero. Good design guidelines should provide
this thesis indicate that the portion of drivers
to negative side friction demand, and considering both
Understanding vehicle performance on horizontal curves ics.
were developed on the 1930's, 1940's, and 1950's.
when traveling on a horizontal curve. Because of
Includes bibliographical references (leaves 64-67).