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this post was submitted on 28 May 2026
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Question?
What's the difference between speed camera data vs "raw speed data"?
Like fuck, my old car would be going 35mph, but the speedometer would read 43mph, but indeed it was only going 35mph..
Ultimately, I calculated my speedometer to be ~22.5% off calibration, but I just got used to it, ignored it altogether, and just kept pace with traffic. Never got a speeding ticket, cuz I'm not stupid...
The page does not explicitly state what device or method is now being used to collect that data. However, now the cameras may be used only for measurement rather than enforcement.
Other methods could include: pneumatic road tubes, inductive loop detectors embedded in pavement, radar speed sensors, LiDAR sensors
If they're going to show this "Data_Collection" then they need to actually specify how it was collected.
Why? Does it make a difference?
Yes, I think it does. I'd like to know exactly where they measured the data and how. If they measured right at a section that goes from 50 to 25 then I'd like to know.
Location is not the same a method of monitoring. And nowhere does the speed limit drop to 25. At best it drops from 50 to 40 through school zones.
Ottawa hosts the data here, and specifies that the speed data was tracked at the same location as the speed cameras were.
The fact that its the same from pre, through installation, and then post means it doesn't actually matter where specifically recorded. Fact is the speed cameras worked in modifying behaviour, which has quickly been undone.
I agree. And I’m disappointed this random chart didn’t come with actual evidence.