Abstract: This conference paper, from the 2002 meeting of the Institution of Professional Engineers New Zealand (IPENZ) Transportation Group, reports on research that investigated the use of curve advisory speed signs in New Zealand. After completing a comprehensive literature review on this subject, the author used a series of optical sensors to observe current traffic speed behavior at the site of curve advisory speed signs. The study focused on effectiveness and compliance. Alternative methods for determining curve advisory speeds, using road geometry data or accelerometer/gyro-based systems, were compared with ball-bank surveys. Ball-bank speeds appeared to fit observed mean speeds very well. Road geometry data can provide a reasonable alternative to field survey measures and appears to present no less accurate a method for assessing curve speeds. The author concludes that automated devices for determining curve speeds should be allowed in New Zealand. Driver compliance with the posted advisory speed was 17%, with 10 km/h above the posted speed was 51%, and with the ball-bank speed was 27%. A move to change the existing curve speed criteria to produce more realistic posted speeds would have a potential impact on safety for drivers.
Publication Year: 2002
Publication Date: 2002-01-01
Language: en
Type: article
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Cited By Count: 10
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