FHWA — Gravel Roads Construction and Maintenance Guide (official reference)¶

Authority: U.S. Federal Highway Administration — federal construction/maintenance guidance for unpaved roads (widely cited in state and extension literature).

Official PDF (verify URL before download in your environment)

• Primary document: https://www.fhwa.dot.gov/construction/pubs/ots15002.pdf
• Note: FHWA occasionally reorganizes publication URLs; if the link fails, search FHWA for publication FHWA-CFL/TD-05-001 / Gravel Roads Construction & Maintenance Guide.

Ingest status: Not yet stored as raw/processed PDF in this repository—listed as recommended primary in Source authority hardening audit backlog. Secondary mentions exist in vendor-captured prose (e.g. dirt-road-stabilization-techniques-long-term-durability-desertmtncorp).

Use in wiki

• Prefer this FHWA guide for grading, crown, drainage, and maintenance claims in canonical road analyses.
• Pair with Authoritative roads and driveways — source cluster and NRCS / extension PDFs already in the vault.

Related¶

• Authoritative roads and driveways — source cluster
• Penn State TB — crown and cross-slope