Example 1.

You are a railroad conductor. You leave your home terminal on a regularly scheduled round-trip run between two cities and return home 16 hours later. During the run, you have 6 hours off at your turnaround point where you eat two meals and rent a hotel room to get necessary sleep before starting the return trip. You are considered to be away from home.

Example 2.

You are a truck driver. You leave your terminal and return to it later the same day. You get an hour off at your turnaround point to eat. Because you are not off to get necessary sleep and the brief time off is not an adequate rest period, you are not traveling away from home.

Members of the Armed Forces.   If you are a member of the U.S. Armed Forces on a permanent duty assignment overseas, you are not traveling away from home. You cannot deduct your expenses for meals and lodging. You cannot deduct these expenses even if you have to maintain a home in the United States for your family members who are not allowed to accompany you overseas. If you are transferred from one permanent duty station to another, you may have deductible moving expenses, which are explained in IRS Publication 521, Moving Expenses.

A naval officer assigned to permanent duty aboard a ship that has regular eating and living facilities has a tax home aboard ship for travel expense purposes.