A STUDY OF ROUNDABOUT - MODE OF OPERATION AND PERFORMANCE
A STUDY OF ROUNDABOUT - MODE OF OPERATION AND PERFORMANCE
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Date
1981-12
Authors
AGILI, EMMANUEL OFILI
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Abstract
In deciding which type of control to provide at an intersection,
there should be some criteria used. A typical criterion
used in some situations is to minimize the delay to vehicles.
While there are established methods for
estimating dalays at signal control, there does not
seem to be any standard or well established method by which the
delay to vehicles at roundabout approach can be obtained. This
thesis presents a procedure by which this delay can be obtained.
The signal control is used here as a typical example of any
other control, the delay produced by the two controls (Roundabout
and Signal Control), at various demand flows and turning problems
are obtained and can then be compared.
Empirically, by modelling the roundabout as a series of
"T" junctions, with circulating flow having priority over
entering flow, it has been shown in the literatures by
previous researchers that the capacity prediction equation
for the roundabout entries can be represented by the linear
entry/circulating flow relationship. This equation gives the
saturated entry flow in terms of circulating flow and some
geometric parameters, basically entry width and flare.
Here, with this entry capacity as obtained above, use is
made of the low definition rectangular type of demand pattern
Description
Thesis submitted in Partial Fulfillment of the
requirements for the award of Master of Engineering
Degree
BY
AGILI EMMANUEL OFILI
December, 1981
Keywords
ROUNDABOUT,, OPERATION,, PERFORMANCE