It's funny how other commenters on HN are telling you what it probably is, even though they might not live in Toronto.
To my knowledge, it isn't any special application of product. It's literally cheap asphalt they pour on top of cracks and potholes and pound it down lightly. The reason why it's surprisingly smooth is because a thousand plus cars have driven over it, flattening it down to road level.
> "Crews place asphalt and rake it into the pothole. Then they tamp down the asphalt and smooth it out until the road surface is improved. The job takes 15-20 minutes."
They do this because it is literally impossible to get to all of the potholes in spring. Want some neat stats?
To my knowledge, it isn't any special application of product. It's literally cheap asphalt they pour on top of cracks and potholes and pound it down lightly. The reason why it's surprisingly smooth is because a thousand plus cars have driven over it, flattening it down to road level.
> "Crews place asphalt and rake it into the pothole. Then they tamp down the asphalt and smooth it out until the road surface is improved. The job takes 15-20 minutes."
They do this because it is literally impossible to get to all of the potholes in spring. Want some neat stats?
https://www.toronto.ca/services-payments/streets-parking-tra...