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An Acton man faces charges for allegedly throwing a hand-sized block of “scrap steel” through the window of another vehicle and endangering the adults and two kids inside, Halton Regional Police said Wednesday.

A woman, man and their two young daughters were travelling in a single eastbound lane on Hwy. 7 in Halton Hills on Monday just after 10 a.m. when a black Ford Ranger pickup truck came baring down on them from behind and began tailgating them, the driver apparently wanting to pass, Det.-Sgt. Nick Milinovich said.

The slower vehicle was not moving fast enough for the driver of the pickup and there was “an exchange” between people in the two vehicles, with the pickup following the family’s vehicle “too closely” for a short period of time, he said.

When the highway turned into two eastbound lanes, the family’s vehicle went to the right to let the truck pass, but the pickup driver did the same in an attempt to pass the family’s car on the right, Milinovich said. The pickup then jerked into the left lane and proceeded to pass the family’s vehicle.

But while passing, the driver of the pickup hurled a heavy, hand-sized “steel block” through his own open passenger window and sent it smashing through the half-open driver’s-side window of the family’s vehicle, police alleged.

The pickup allegedly sped off but not before the man and woman in the car were able to note the plate number.

The woman driver of the family car suffered a scrape and bruising to her back from being hit with the piece of steel, and the two children — a five-year-old and three-month-old — were hit with shards of broken glass. Both kids were examined by EMS but were not injured, Milinovich said.

Edwin Hepburn, 27, turned himself in on Tuesday. He is charged with dangerous driving, mischief endangering life, assault with a weapon, and mischief. He was released on a promise to appear in court.

In a 2011 survey by the Canadian Automobile Association, road rage was one of the items topping a list of bad roadway behaviours Canadian drivers felt were on the rise.