Officials believe extreme heat is behind the pavement deformations.
Martin Girard, a spokesperson for the ministry, said that road bumps like this are not unusual during the summer months.
The flagstone underneath the roadway expands on hot days and could ultimately cause a fissure in the road, Girard said.
"The ministry knows that situation and that's why there's a project to rebuild Highway 30 between Contrecoeur and Sorel-Tracy," said Girard.
The project is scheduled to start by the end of the summer and is expected to take four years to complete.
The highway is currently closed between exits 126 and 135. People accessing Highway 30 East can follow a detour at exit 126.
The highway is scheduled to reopen Tuesday night.Suggest a correction