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The human-machine interface (HMI) of a warning system should not be the cause of unintended consequences, such as startling or confusing the driver. The driver should be able to quickly understand and assess a threat and appropriately respond to the external event. In most instances, warning signals are used to inform the driver of a situation that he/she does not perceive on his/her own. If the driver is not aware of the situation, then the warning signal should be comprehended and clearly distinguished from other warning signals. Timely Comprehension is a laboratory methodology developed with the goal of evaluating integrated warning systems in development. Currently, no standardized verification method publically exists to evaluate the in-vehicle integration of warning systems. This methodology can help identify comprehension/distinguish-ability issues prior to full system development in a controlled, repeatable and safe setting.