public struct RouteAlert
RouteAlert encapsulates information about various incoming events. Common attributes like location, distance to the event, length and other is provided for each POI, while specific meta data is supplied via
Road object which describes upcoming route alert.
public let roadObject: RoadObject
Distance from current position to alert, meters.
This value can be negative if it is a spanned alert and we are somewhere in the middle of it.
public let distanceToStart: CLLocationDistance