Hamilton police warned of a "big delay" for morning trips after rollover transportation trucks on Red Hill Valley Parkway.
A single vehicle collision occurred at around 4:30 a.m., police said. The road will be closed for several hours while cleaning takes place. Both the north and south lines in the area are closed.
Fire Chief Dave Cunliffe said in a statement that a tanker carrying around 40,000 liters of liquid asphalt had rolled over after crashing into the bridge of the CP railway that crossed Bukit Merah south of King Street.
"Liquid asphalt leaked from the tanker across the north to the bottom through the middle median and across one southern lane," Cunliffe said. "The Hamilton Fire Department hazmat team is able to hold products that are leaking from tanker units and regulate detention systems in the median and highways."
The emergency crew estimates that around 30,000 liters of asphalt leak from the tanker.
Two people who were in the truck when the accident happened were pulled out of the wreckage by firefighters using the air stairs and were later assessed by paramedics, Cunliffe said. Police said they were taken to hospital to be treated for minor injuries.
The fire crew notified the Ministry of Environment and the city public works department, and CP sent representatives to the scene to assess the bridge.
No evacuation is needed, Cunliffe said.
Researchers are now trying to find out what caused the collision. The police said that there were no criminal charges or Road Traffic Laws that had been laid.