I've heard reports of tens of thousands of trucks. It's a shame the highway cameras were turned off.
I see claimed that the Ontario Provincial Police say there are 100k to 130k trucks, but I can't see anything official to back that up -- nothing on their twitter feed or website. Maybe on the radio -- but not something I can easily check.
Here's someone on the ground who thinks there are 250k to 1 million people protesting in Ottawa right now. https://twitter.com/JuliusRuechel/status/1487570992356634625...