| Designator | RTM18a-19b |
| Category | Rail (R) |
| Type | Thrie-Beam (T) |
| Function | Main Member (M) |
| Manufacturer | Non-Proprietary |
| FHWA Eligibility Letter | |
| Contact | Midwest Roadside Safety Facility |
| Drawings | RTM18a-19b_20161206final.pdf |
| Other Docs | |
| Archive | RTM18a-19b_draft20150724_comments&responses.pdf |
| External Links |
2- & 4-Space Thrie-Beam Guardrail
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