The traffic jam is the stressor.
Any scenario or incident that the person perceives as a threat or challenge (in this case the traffic jam) is a psychological stressor. The fact that psychological stresses are perceived dangers rather than physical conditions like the body's reaction to heat, cold, or weariness does not make them any less dangerous or potentially destructive.
The severity of psychological stressors varies, mostly depending on how the stressor is viewed. Subjective psychological stress increases in proportion to perceived threat or challenge to homeostasis, which is a momentary condition of peace and wellbeing.
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