The Sûreté du Québec says a truck driver was caught on camera performing a U-turn on the Jacques Cartier Bridge on Wednesday morning.
It happened at around 9: 35 at the exit for the Parc Jean-Drapeau.
The semi-truck was heading towards Montreal from the south shore when the driver started the manoeuvre, briefly blocking all five lanes of traffic.
The driver has since been tracked down.
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Police say the manoeuvre could have resulted in a collision.
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This type of offence can lead to a $1,546 fine for reckless driving and four demerit points.
Police said the road was open to traffic at the time of the offence.