[mikedougherty]

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.

[seanplaice]

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

[Aloisius]

Ahh, it isn't just bike couriers then?

[bastian]

No we have couriers on bikes, cars and trucks.