Describes the roadblocking types.

| Enums ||
|---|---|
| `ROADBLOCKING_TYPE_UNSPECIFIED` | Default value. This value is unused. |
| `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). |
| `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. |
| `CREATIVE_SET` | A master/companion creative set roadblocking type. A `https://developers.google.com/ad-manager/api/beta/reference/rest/v1/CreativePlaceholder` must be set accordingly. |
| `ONE_OR_MORE` | Any number of creatives from a line item can serve together at a time. |
| `ONLY_ONE` | Only one creative from a line item can serve at a time. |