Final answer:
The claim that a 34-hour restart is never mandatory and is optional is true. This provision is part of the FMCSA's HOS regulations and allows drivers to reset their weekly hours.
Step-by-step explanation:
The statement that a 34-hour restart is never mandatory and is optional is True. The 34-hour restart provision is part of the Federal Motor Carrier Safety Administration's (FMCSA) Hours of Service (HOS) regulations, which apply to commercial motor vehicle drivers. The provision allows drivers to reset their weekly driving limits by taking a continuous 34-hour off-duty period. However, it is not mandatory - it is an option available to drivers who wish to restart their weekly hours to maximize their on-duty time.