Police 'deleted' details from bus crash report, expert testifies

A collision expert testifying at the trialof the driver involved in the Westboro bus crash says police investigators "deleted" key factors from later versions of their reportinto the deadly incident.

Aissatou Diallo, 44, has pleaded not guilty to 38 dangerous driving charges against her relating to the collision on Jan. 11, 2019, including three counts of dangerous driving causing death.

Richard Lamoureux, a collision reconstruction expert from DFA Engineering Services Inc., testified via Zoom on Monday that he had reviewed drafts of the police reconstruction reports and mentioned elements of them in his final report. The policereports were not submitted into evidence by the Crown.

According to Lamoureux, police initially considered sun glare and confusing road markings as contributing factors in the crash, but didn't include those details in later reports. Lamoureux said in his expert opinion, both had indeed been factors in the crash.

Warning: some viewers may find the following video disturbing

Video shows journey toward Westboro station before crash

4 years ago

Duration 0:09

This video, facing out the front windshield of the bus, shows the vehicle hitting the shoulder of the transitway moments before colliding with the bus shelter at Westboro station.

Lamoureux said one draft of the police report noted a painted line,left over from an earlier construction detour,2.6 metres from the edge of the Transitway, the same width as a double-decker bus. The detail was potentially significant because it suggested a driver could mistake the line for a lane marker and accidentally steer into the gutter at the edge of the roadway, he said.

"This information that's in the earlier reports is deleted from the final report," Lamoureuxnoted. "It was perplexing to me to read these reports and find that they were on the right track, [that] they're finding factors here that are important to the cause of this collision ... but then they're subsequently deleted from analysis."

Lamoureux said he also differed from police in his interpretation of a rising shadow seen in one of the videos captured bythe bus before the crash. He interpreted thedetail as an indication that Diallo hadattempted to steer left, away from the edge of the road.

Expert also omitted details, Crown suggests

Crown lawyer Dallas Mack questionedthe expert's interpretation, however, suggestingLamoureux had also failed to include certain details inhis final report.

According to a police officer's report, Diallosaid after the crash that the express bus was "not supposed to stop at Westboro station," contradictingLamoureux's conclusion that she was responding to a stop request as the bus approached the station.

Lamoureux said the vehicle'smovement before the crash, captured on video by a bus driving behind, was gradual and resembled an intentional lane change, not a bus veering out of control. He said he didn't include Diallo's comment because his report focusedon video and physical evidence.

Diallo tried to steer away: Defence

Lawyer Fady Mansoursaid Diallo's defencewill present evidence that sheattempted to steer away from the gutter, but the rapid succession of three separate collisions the bus struck a rock wall, a snowbankand finally the shelter awning gave her no time to react and hit the brakes.

• Driver in fatal bus crash didn't meaningfully brake or steer, Crown argues

Mansour said there's video evidence that Diallo was responding to a stop request at Wesbtoro station, and that's why she was approaching the stationin the right-hand lane.

The judge-alonetrial, which is being conducted viaZoom due to COVID-19 restrictions, resumes Tuesday.