FMVSS No. 127: automatic emergency braking systems for light vehicles (49 CFR 571.127)
New passenger cars and light trucks must have automatic emergency braking that avoids collisions with vehicles and pedestrians across specified speeds, day and night, with a forward collision warning and a telltale when the system is malfunctioning or switched off.
Draft mapping. Drafted by the Register's agents from the rule's text and not yet confirmed by a person. It is the Register's reading, not legal advice: whether and how the rule applies to you is a question for counsel.
Controls this rule maps to
Required by the text The rule's text requires a measure that is this control, or plainly includes it. Implied A binding rule whose purpose needs this control, but whose text does not name it. The Register's reading. Recommended A voluntary standard or guidance recommends it; nothing binds you to it. Proposed Appears in a proposed rule or proposed provision that is not yet in force.
| Control | Strength | Where in the rule, and why | Confidence | Missing or failed in |
|---|---|---|---|---|
| Automated fail-safe C-R2 | Required by the text | the vehicle must brake on its own to avoid the collision when the driver does not | high | 2 cases |
| Warnings designed as alerts C-I4 | Required by the text | forward collision warning to the driver before automatic braking | high | 4 cases |
| Degraded-input detection C-I3 | Required by the text | malfunction indication when the system cannot perform | medium | 3 cases |