http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Validation of and enhancements to an operating-speed-based geometric design consistency evaluation model
viii, 63 leaves : illustrations ; 28 cm.
0.85 M/S2 is reasonable for the purposes of this model.
85th percentile speed on tangents is not statistically
85th percentile speeds revealed that the current speed-
acceleration and deceleration behavior of drivers approaching
acceleration and deceleration on curves and their tangents
acceleration and deceleration rates indicate that the
acceleration and deceleration rates revealed that adjustments
alignment, especially in and near curves. Tests of mean
and analysis procedures used to analyze operating speeds,
and departing horizontal curves. Detailed data collection
are presented. Hypothesis tests of mean observed and
assumption of equal acceleration and deceleration rates at
consistency evaluation procedure: (1) the speed reduction
different from the assumed desired speed on tangents (97.9
different from the estimated mean reduction in operating
estimated speed reductions resulted in the conclusion that,
estimation ability of the model, and (2) assumptions about
for curves with no downstream intersections, the mean
Further research is needed to confirm this conclusion. The
Hypothesis tests of mean observed 85th percentile speeds on
in acceleration and deceleration take place throughout an
km/h) at a 0.05 significance level. Inspection of implied
observed reduction in operating speed is not statistically
profile model fits the observed data reasonably well.
related to an operating-speed-based geometric design
results of this thesis support the continued use of the model
speed at a 0.05 significance level. Analysis of observed
tangents resulted in the conclusion that the mean observed
This thesis documents efforts to validate two elements
until further research is conducted to enhance the model
Issued also on microfiche from Lange Micrographics.