A Study of Detector Reliability for a Safety Warning System on the Gulf Freeway.

摘要

An experimental warning system has been installed on the Gulf Freeway in Houston as a means of alerting drivers approaching crest type vertical curves of stoppages downstream of the crest. The frequency of detector failures prompted a study to evaluate the reliability of the warning system based on the detector failure and repair rates experienced on the Gulf Freeway surveillance and control system to ascertin whether detector redundancy or improved maintenance would be necessary. Classical models relating to reliability of maintained and non-maintained systems were employed. Reliability functions for warning signs installed at isolated locations are also presented.