Step 03 · Category rollup
BASIC breakdown
The same line items roll up into the six FMCSA compliance categories. The bars are built from the exact ledger points - no recomputation - so they sum to the same total.
Total74 pts → index 100
Per-inspection cap of 30
Real SMS caps the summed severity for one inspection within a BASIC at 30, before time-weighting - a capped total attributed worst-first, not a proportional rescale. No inspection on this driver hit the cap - see the ‘Cap-30 stress case’ driver.
Time-weight decay
≤6 mo ×3 · ≤12 mo ×2 · ≤24 mo ×1 · >24 mo drops out (×0). Recency is emphasized exactly as FMCSA weights it.
Adapted at driver level
FMCSA BASICs score carriers. Here the carrier-SMS mechanics are adapted to a single driver file - disclosed, not an official driver score.