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Paper Title:
Use of Curve Advisory
Speed Signs in New Zealand
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Authors:
Glen Koorey, Fergus Tate,
Peter Cenek, Shona Page
Abstract:
The use of curve advisory
speed signs in New Zealand was investigated. Traffic behaviour at
the location of curve advisory speed signs was observed to determine
the effectiveness of and compliance with current practice. Alternative
methods for determining curve advisory speeds, using road geometry
data or accelerometer-based systems, were compared with ball-bank
surveys. The existing criteria and methods used for setting curve
advisory speeds in New Zealand were assessed in light of the above
findings and changes suggested. The field surveys found that the
current ball-bank criteria underestimated observed mean speeds.
A revised ball-bank relationship that did not take vehicle speed
into account resulted in a much better fit. Allowing the use of
alternative advisory speed methods is also recommended.
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