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I'm confused. Why are there so many deliveries happening in the middle of the bridge?

Apparently it's a heat map of courier paths, not endpoints. So the dots on the bridges just signify that deliveries are going out of the city.

Mike, you are correct. It is a heat map of the paths taken by the couriers while doing deliveries. I work at Postmates.

Ahh, it isn't just bike couriers then?

No we have couriers on bikes, cars and trucks.