| Designator | STB12 |
| Type | Bridge Rail-to-Guardrail (B) |
| System 1 | Thrie-Beam Guardrail |
| System 2 | NJ-Shape Concrete Bridge Railing |
| Test Specification | AASHTO MASH 2016 |
| Test Level | TL-3 |
| Drawing Status | No Drawing |
| Perm/Temp | Permanent |
| Contact | Midwest Roadside Safety Facility |
| Manufacturer | Non-Proprietary |
| FHWA Eligibility Letter | B-214.pdf |
| Components | |
| Drawings | |
| Other Docs | |
| Archive | |
| External Links |
Thrie-Beam Transition to NJ-Shape Concrete Barrier
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