The 2 hour adverse weather and the 2 hour extension are two different things.
(b) Adverse driving conditions. (1) Except as provided in paragraph (h)(2) of this section, a driver who encounters adverse driving conditions, as defined in § 395.2, and cannot, because of those conditions, safely complete the run within the maximum driving time permitted by §§ 395.3(a) or 395.5(a) may drive and be permitted or required to drive a commercial motor vehicle for not more than 2 additional hours in order to complete that run or to reach a place offering safety for the occupants of the commercial motor vehicle and security for the commercial motor vehicle and its cargo. However, that driver may not drive or be permitted to drive-
(b)(1)(ii) After the end of the 14th hour since coming on duty following 10 consecutive hours off duty for drivers of property-carrying commercial motor vehicles;
E-4. May a driver utilize the adverse driving rule, which extends the driving time by two additional hours, in conjunction with the 16-hour exception?
No. A driver may not use the exception for adverse driving conditions while also using the 16-hour exception for property-carrying drivers. Section 395.1(b)(1)(ii) of the adverse driving conditions exception specifically states that a property-carrying driver may not drive or be permitted to drive after he/she has been on-duty after the end of the 14 th hour after coming on-duty following 10 consecutive hours off-duty.
Adverse driving conditions means snow, sleet, fog, other adverse weather conditions, a highway covered with snow or ice, or unusual road and traffic conditions, none of which were apparent on the basis of information known to the person dispatching the run at the time it was begun
Property-carrying driver. A property-carrying driver is exempt from the requirements of §395.3(a)(2) if:
(o)(1) The driver has returned to the driver's normal work reporting location and the carrier released the driver from duty at that location for the previous five duty tours the driver has worked;
(o)(2) The driver has returned to the normal work reporting location and the carrier releases the driver from duty within 16 hours after coming on duty following 10 consecutive hours off duty; and
(o)(3) The driver has not taken this exemption within the previous 6 consecutive days, except when the driver has begun a new 7- or 8- consecutive day period with the beginning of any off-duty period of 34 or more consecutive hours as allowed by §395.3(c).