Drivers report that their symptoms of road rage can be reduced if the driver they are angry with

Makes a gesture of apology.

Explanation:

When someone causes you to drive badly on the road and they show no remorse for their actions , it is most likely infuriating because you almost lost your life and it seems the person responsible for that doesn't even care.

However if a person shows a gesture of apology it is likely to indicate that they see their mistake and they are sorry for that, as a human being it is easy to settle down your anger when someone humble themselves and show an apology.

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