OptionalstopTimeInSeconds?: numberThe time in seconds the vehicle stands still at the stop this leg arrives at.
It is the wait a WaypointProps.pauseDurationSeconds asked for, as the service actually
planned it rather than an echo of the request. That is the gap between this leg's arrivalTime
and the next leg's departureTime.
travelTimeInSeconds is driving only and excludes the stop, while the
route's total includes every stop. So driving time is the sum of the legs, and the time
spent standing still is the difference.
The summary of a single route leg, the portion of the route between two consecutive waypoints.