TripProgressUpdateValue   
    Represents a trip progress update to be rendered
Parameters
estimatedTimeToArrival   
the estimated time to arrival
distanceRemaining 
the distance remaining
currentLegTimeRemaining   
the time remaining for the current leg
totalTimeRemaining  
the total time remaining
percentRouteTraveled  
the percentage of the route traveled
trafficCongestionColor  
reserved for future use
formatter
an object containing various types of formatters