Emergency condition requiring immediate response
Emergency condition requiring immediate response means any condition that, if left unattended, is reasonably likely to result in immediate serious bodily harm, death, or substantial damage to property. In the case of transportation of propane winter heating fuel, such conditions shall include (but are not limited to) the detection of gas odor, the activation of carbon monoxide alarms, the detection of carbon monoxide poisoning, and any real or suspected damage to a propane gas system following a severe storm or flooding. An emergency condition requiring immediate response does not include requests to refill empty gas tanks. In the case of a pipeline emergency, such conditions include (but are not limited to) indication of an abnormal pressure event, leak, release or rupture.
49 CFR § 390.5T
Unless specifically defined elsewhere, in this subchapter: