road agent

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

• noun A stagecoach robber; a bandit.

from The Century Dictionary.

• noun One who collects dues from travelers on private roads; hence, jocosely, a highwayman.

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

• noun archaic A criminal who accosts travelers and robs them.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a holdup man who stops a vehicle and steals from it