Halton Regional Police said the interaction took place around 6:30 a.m. in the area of Postridge Drive and Trafalgar Road on Monday.
Police alleged the driver of a beige 2007 Ford Edge stopped his vehicle and pointed a firearm at another driver in an altercation that officers called road rage.
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The man was described as in his 40s with a heavy build. He was bald and unshaven, wearing a blue T-shirt and shorts, according to police.
In an update Monday evening, police said an arrest had been made.