Frequently Asked Questions
The Frequently Asked Questions (FAQs) are questions and answers about Compliance,
Safety, Accountability (CSA) that the Federal Motor Carrier Safety Administration
(FMCSA) compiled to assist the public. As questions come in through the website,
FMCSA adds them to the database along with their answers. If you do not see your
question or topic addressed, please
by submitting a feedback form. We will respond to you directly and consider your
question for inclusion in the FAQs.
The FAQ area has recently been enhanced. Users can now search FAQs by stakeholder
group, topics (displayed on the left side of the page), or by entering a keyword
below. Choosing “Show All” will display the entire collection of FAQs.
How do I change my MCS-150 data, such as Vehicle Miles Traveled (VMT) or Power Units
Although the Federal Motor Carrier Safety Administration (FMCSA) suggests that motor
carriers update their MCS-150 every two years, motor carriers should understand
that this is just the minimum requirement; motor carriers may update their MCS-150
form at any time. FMCSA encourages carriers to update their MCS-150 any time there
is a change in their data. Since the Safety Measurement System (SMS) uses VMT and
PU data, motor carriers should update their form at least once a year. Motor carriers
can update their MCS-150 data by selecting: “I need to update my U.S. DOT Number
registration information or file my biennial update” and following the instructions.
For instructions on updating your
MCS-150 form, visit the
The SMS updates monthly. MCS-150 changes will not appear immediately in the SMS,
but likely will show up the following month. However, MCS-150 updates should show
up more quickly on SAFER.