code: public void setRoadblockingType(com.google.api.ads.admanager.axis.v201805.RoadblockingType roadblockingType) {
          this.roadblockingType = roadblockingType;
      }
docs: Sets the roadblockingType value for this ProposalLineItem.
  
  @param roadblockingType   * The strategy for serving roadblocked creatives, i.e. instances
  where
  multiple creatives must be served together on a single
  web page. This attribute
  is optional during creation and defaults to the
  {@link Product#roadblockingType product's roadblocking
  type},
  or {@link RoadblockingType#ONE_OR_MORE} if not specified
  by the product.