We can better predict drivers' behavior at traffic lights from knowing the color of the lights than from knowing the drivers' personalities. this best illustrates the importance of

This best illustrates importance of situational influences
situational influences Refers to The conditions that influenced someone's decision in a temporary manner.
In observing driver's behavior in the street, it is important to know other aspects that happen to the driver which could influence his/her behavior when driving the wheel (such as personal relationship problem, other driver's behavior, etc)

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