This interface should be implemented in order to receive information on the upcoming toll booth structure.

The warner might also warn about gates/checkpoints for vignette, border checkpoints and similar structures on the street.

Note: This is a beta release of this feature, so there could be a few bugs and unexpected behaviors. Related APIs may change for new releases without a deprecation process. A TollStop will not be given until the previous warning of that type has been passed. For example, a route with TollStop 120 meters and TollStop 160 meters ahead, the first TollStop.distance_to_toll_stop_in_meters is 120 meters and the next TollStop.distance_to_toll_stop_in_meters is then 40 meters, since that is the distance between the first and second warnings.