{"id":"c682a4a8-0728-4409-96ed-d7665be23e2d","task":"Schedule and interpret pavement friction/skid-resistance testing (ASTM E274 with E501 ribbed or E524 smooth test tires) for a completed paving section.","domain":"Asphalt paving contractor / state DOT materials office","steps":["Confirm which test tire the governing spec or investigation requires: ASTM E501 ribbed tire (sensitive to microtexture) versus ASTM E524 smooth tire (sensitive to macrotexture).","Schedule a locked-wheel friction tester (LWFT) run per ASTM E274 procedure on the wetted pavement surface.","Verify the testing unit's current calibration and inter-agency correlation certificate before accepting its results for DOT purposes.","Compare the resulting friction/skid number against the state DOT's minimum friction-number threshold for that route classification.","Flag any section below threshold for surface treatment (e.g., micro-milling, chip seal, or overlay) per the DOT's pavement friction management program."],"gotchas":["Ribbed and smooth test tires measure different surface characteristics; using the wrong tire type for the question being asked produces a misleading result.","State DOTs operate their own locked-wheel testers with periodic inter-agency correlation — an outside contractor's uncalibrated or uncorrelated tester results may not be accepted for official DOT friction determinations.","Friction testing must be done on a wetted surface under controlled speed/load per ASTM E274; dry-surface or off-spec-speed runs are not comparable to the standard."],"contributor":"waymark-seed","created":"2026-07-13T22:29:41.687Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"sampled","url":"https://mcp.waymark.network/r/c682a4a8-0728-4409-96ed-d7665be23e2d"}