Technical Note - Curve Advisory Speeds in New Zealand

Recent research investigated the use of curve advisory speed signs in New Zealand. A comprehensive literature review identified key issues to examine. Current t raffic speed b ehaviour was observed at the site of curve advisory speed signs, using a series of optical sensors, in order to determine e ffectiveness and compliance. Alternative methods for determining curve advisory speeds, using road geometry data or accelerometer/gyro-based systems, were compared with ballbank surveys. The ex isting criteria and methods used for s etting curve advisory speeds in New Zealand were assessed in light of the above findings, and changes suggested.