Systems Engineering developing your functions and sub-functions:

The trucking industry is regulated by the Federal Motor Carrier Safety Administration (FMCSA) and they have imposed The Hours of Services (HOS) regulations. The HOS regulations address the number of hours a CMV driver may drive, and the number of hours a CMV driver may be on duty before rest is required.

In addition, they address the minimum amount of time that must be reserved for rest and the total number of hours a driver may be on duty in a "work-week". You can use any of the diagramming and modelling methods.

Complete exercise to include NHSTA Crash Statistic, HOS Department of Transportation Report, HOS Guidelines and Rand McNally User Manual for a similar device.

The following statements can help you in developing your functions and sub-functions:

Need a functioning decomposition diagram and the information.

Improve compliance with Hours of Service rules.
Improve driver health benefits.
Reduce the occurence of crashes due to driver fatigue
Reduce daily driving time.
Increase driver productivity.
Increase driver sleep.

Reference

1. 2010-2011 Hours of Service Rule - Regulatory Impact Analysis RIN 2126-AB26 By Analysis Division Federal Motor Carrier Safety Administration

2. Traffic Safety Facts 2014 Data (NHTSAs National Center for Statistics and Analysis)

Attachment:- function decomposition sample.rar