Final answer:
The Redex trials began in 1955 and were a series of endurance car races held in Australia.
Step-by-step explanation:
The Redex trials began in 1955. These trials were a series of endurance car races that took place in Australia. The purpose of the Redex trials was to test the reliability and performance of vehicles over long distances. The first Redex trial was held in 1953, but it was in 1955 that the trials gained national attention and became an annual event.