road warrior

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A person who travels frequently, especially on business.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun informal A frequent business traveller
• noun slang, business A salesperson who spends a lot of time traveling and outside the office.
• noun slang A person who carries a mobile device such as a laptop or PDA and uses wireless internet connections to work.