http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Comparison of day and night vehicular speeds on horizontal curves on rural two-lane highways
viii, 62 leaves : illustrations ; 28 cm.
16 curves had a significantly higher speed reduction at night
accounting for light condition is not needed for operating-
and nighttime speeds. However, no discernible pattern for
and the speed at the midpoint of the curve. Hypothesis tests
approach tangents resulted in the conclusion that a small
daytime and nighttime speed reduction from the approach
difference between the speed at the midpoint of the tangent
discernible pattern was evident. Statistical tests of the
highways. For each selected curve, daytime and nighttime
large percentage of statistically significant differences in
magnitude of the difference between daytime and nighttime
mean speeds at the midpoint of curves were observed, no
nighttime speeds at the midpoint of horizontal curves showed
of daytime and nighttime speeds at the midpoint of the
operating speeds were measured using piezoelectric sensors.
percentage of curves exhibited a difference between daytime
significantly different from nighttime speeds. Even though a
Speed data was collected in each direction at the midpoint of
speedbased profile modeling for horizontal alignment design
speeds is small for all degrees of curvature, a variable
speeds on rural, two-lane highways. However, because the
tangent to the midpoint of the curve showed that five out of
than during the day. The results of this research indicate
that over half the curves tested had daytime speeds that were
that there are some differences between daytime and nighttime
the approach tangent and at the midpoint of the curve. A
the results could be found. Hypothesis tests of daytime and
This thesis documents the research comparing day and night
vehicle's speed reduction was then calculated as the
vehicular speeds on horizontal curves on rural, two-lane
Issued also on microfiche from Lange Micrographics.
Includes bibliographical references: pages 53-55.