System, methods, and other embodiments described herein relate to improving alerts to a passenger about hazards when exiting a subject vehicle. In one embodiment, a method includes, in response to identifying a target in a surrounding environment of the subject vehicle, estimating a target path of the target. The method includes selectively adjusting an activation threshold for providing an alert according to a curvature of the target path. The method includes activating the alert to inform the passenger of a hazard associated with the target according to whether the target path satisfies the activation threshold.