AI-generated Key Takeaways
- 
          RoadblockingType describes the types of roadblocking available for line items. 
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          Roadblocking types determine how many creatives from a line item can serve at a time. 
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          Roadblocking options include serving only one, one or more, as many as possible, all, or using a creative set. 
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          The ALL_ROADBLOCK option specifically works with GPT tags using single request architecture mode. 
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          CREATIVE_SET roadblocking requires setting LineItem.creativePlaceholders accordingly. 
Describes the roadblocking types.
- Namespace
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               https://www.google.com/apis/ads/publisher/v202508
| Enumeration | Description | 
|---|---|
| ONLY_ONE | Only one creative from a line item can serve at a time. | 
| ONE_OR_MORE | Any number of creatives from a line item can serve together at a time. | 
| AS_MANY_AS_POSSIBLE | As many creatives from a line item as can fit on a page will serve. This could mean anywhere from one to all of a line item's creatives given the size constraints of ad slots on a page. | 
| ALL_ROADBLOCK | All or none of the creatives from a line item will serve. This option will only work if served to a GPT tag using SRA (single request architecture mode). | 
| CREATIVE_SET | A master/companion CreativeSet roadblocking type. A LineItem.creativePlaceholders must be set accordingly. |