Reading the sheet…
| Place by Loads |
|---|
Each dot is the 150-mile Market around that city, not the city itself. It prints its Loads over its Trucks, and its size is that same Loads. The Ratio between the two is the colour — hover for the figure the sheet holds.
A Run reads every Market's Loads before any Market's Trucks, so the two counts behind each Ratio were taken minutes apart rather than at one instant.