A route KPI object contains the route KPIs for a single vehicle. It has the following fields:
Field: site_time
Type: String (HH:MM).
Description: The site time incurred in the route. (See Site Time in Section 2.10.)
Field: delivery_soft_time_window_late
Type: String (HH:MM).
Description: If there are orders with delivery soft time windows, then this is the total amount of time that
orders were delivered late in the route.