The DOT has made some CFR part 40 rule changes. Here are links to the information:
https://www.transportation.gov/odapc/Part_40_DOT_Employee_Notice_2017
https://www.transportation.gov/odapc/Part_40_Final_Rule_Summary_of_Changes
https://www.transportation.gov/odapc/Notice_CCF_December_2017
https://www.transportation.gov/odapc/Part_40_DOT_Policies_Notice_2017
Here is a PDF that you can download to use to inform your employees: