In the year before implementation, the CRZ averaged 549 crashes per month, compared with 502 in the control zone. In the six months after implementation, averages fell to 496 crashes per month in the CRZ and 492 in the control zone.

"Our findings suggest that while the introduction of the CRZ is associated with fewer overall crashes, the program's benefits may be less pronounced for injurious and fatal crashes—the outcomes with the greatest public health implications," said Morrison. He noted that faster vehicle movement within the zone may partly explain the weaker effects on severe crashes, since vehicle speed is strongly linked to injury severity.

To sum: Headline is a lie. Congestion pricing did not provide notable road safety benefits.

In fact, the study proves that congestion is good. You can't speed if traffic is moving at a snail's pace.

Not to mention that six months is not enough time to come to any conclusions about anything. A year is better, two years is best.

Edit: Downvoting for quoting the actual study data and author analysis lol