code: @NonNull
    public static List<StepIntersection> createIntersectionsList(@NonNull LegStep currentStep, LegStep upcomingStep) {
      List<StepIntersection> intersectionsWithNextManeuver = new ArrayList<>();
      intersectionsWithNextManeuver.addAll(currentStep.intersections());
      if (upcomingStep != null && !upcomingStep.intersections().isEmpty()) {
        intersectionsWithNextManeuver.add(upcomingStep.intersections().get(FIRST_POINT));
      }
      return intersectionsWithNextManeuver;
    }
docs: Given a current and upcoming step, this method assembles a list of {@link StepIntersection}
  consisting of all of the current step intersections, as well as the first intersection of
  the upcoming step (if the upcoming step isn't null).
  
  @param currentStep  for intersections list
  @param upcomingStep for first intersection, if not null
  @return complete list of intersections
  @since 0.13.0