N.B. man who used 'zipper merge' in heavy traffic says it sparked a road rage incident

Terry Sznober thought he was doing the right thing. He was in heavy traffic on Saint John's Harbour Bridge and saw signs saying that traffic would be reduced to one lane in about two kilometres.

So he did what he always does in such situations: he employed the "zipper merge." 

The zipper merge, for those who aren't familiar with it, has drivers stay in their lane and delay merging until the moment their lane comes to an end. Then, when they reach the bottleneck, drivers from each lane take turns entering the reduced lane, merging like the teeth of a zipper.

But while it's widely adopted in some countries, such as Germany, it hasn't really caught on in Canada.

"The driving public sees those reduced-lane signs, and they assume that, 'Oh, I need to get in that left lane right now,'" Sznober said. "So the right lane is completely open for two kilometres, and no one's using it.… You start to see them straddling both lanes, you know, trying to defend their spot."

In short, many drivers misunderstand the zipper merge as a bully tactic. And on Tuesday night, Sznober found that out the hard way.

He passed a white, cube-shaped commercial truck that had just merged into the right lane, which was soon ending, and when he reached the point where the two lanes were reduced to one, traffic came to a standstill.

That's when Sznober said he saw the driver of the truck get out of his vehicle and walk up to the back of Sznober's car.

"I thought, OK, he's going to shout at me through my window or something," Sznober said.

"Then he disappeared in my blind spot, then a second of silence or so — and then all of a sudden, a big boom, and glass went flying everywhere inside my car. Then I saw him out my rear-view mirror again, stomping up the hill and then get back into his truck."

The man had shattered the rear passenger window of Sznober's car.

Sznober, who was alone in the vehicle, said he was uninjured but shocked. He was unable to get the truck driver's licence plate number and is hoping someone has dash-cam footage from the scene.

He did report the event to the Saint John police, who confirmed Wednesday that they'd had a report of an incident on the Harbour Bridge on Tuesday evening but said the driver "has not been identified."

"Construction season can certainly be a frustrating time, and the [Saint John Police Force] encourages drivers to be courteous when behind the wheel," communications manager Jim Hennessy said in an email.