The evolution of international collision regulations transitioned from informal 16th-century maritime customs to a rigorous legal framework with the adoption of the 1972 COLREGs, which transformed the rules into a standalone, binding treaty. This pivotal version introduced Traffic Separation Schemes (TSS) to manage congested waterways and integrated modern technology by mandating the use of radar for lookout and risk assessment. A critical legal refinement occurred with the introduction of the "not to impede" concept in Rules 9 and 10, later clarified by the 1987 Amendment (Rule 8(f)), which shifted the burden of safety onto smaller, more manoeuvrable vessels to ensure they take early action to stay clear of large ships.

In this episode Barry tells the history of the collision regulations, from the 16th century up to modern times. He discusses the changes and advances that were necessary in order to continue to protect shipping as it evolved over centuries.

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