code: @DirectionsCriteria.VoiceUnitCriteria
    public String getUnitTypeForLocale(@NonNull Locale locale) {
      switch (locale.getCountry()) {
        case "US": // US
        case "LR": // Liberia
        case "MM": // Burma
          return DirectionsCriteria.IMPERIAL;
        default:
          return DirectionsCriteria.METRIC;
      }
    }
docs: Returns the unit type for the specified locale. Try to avoid using this unnecessarily because
  all methods consuming unit type are able to handle the NONE_SPECIFIED type
  
  @param locale for which to return the default unit type
  @return unit type for specified locale