| Designator | RTM04a-b |
| Category | Rail (R) |
| Type | Thrie-Beam (T) |
| Function | Main Member (M) |
| Manufacturer | Non-Proprietary |
| FHWA Eligibility Letter | |
| Contact | |
| Drawings | RTM04a-b_20250328.pdf |
| Other Docs | |
| Archive | RTM04a-b (RE-63-76)_1979.pdf RTM04a-b_1995.pdf |
| External Links |
4-Space Thrie-Beam Guardrail
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