The Food and Agriculture Organization and others call it the "West Asian - East African Flyway" is a group of well-established routes by which many species of birds migrate annually between mid-Palearctic breeding grounds in Asia and non-breeding sites in eastern and southern Africa.

Even in "cleared" areas, you should keep to well-established routes and take up-to-date advice from the United Nations or an international Non-Governmental Organisation.

It branched from the Oregon Trail in southeastern Idaho and ran north through eastern Idaho along a well-established native American route into western Montana.

Companies are opening offices in suburban locations, requiring people to drive on less well-established routes from suburb to suburb.

Illegal immigrants have a long history of following well-established routes," said Mr. Castillo, "and the amnesty program gave those routes a little more solidity.

"There's a kind of unwritten rule here that we don't shoot your principal agents, knock down your satellites, or shoot down your planes flying well-established routes," said an elder of the American intelligence community, "and you don't shoot at ours."

Exactly why he left for America in mid-career is uncertain (money troubles, most probably), but he was following a well-established route.

Ignoring other lengthy, but well-established routes, leaders of the mission opted to try a "short cut" by way of Escalante that would take them through almost completely unexplored country.

The canoes traveled along well-established routes.

But most of the time, the ship's science officer was the redheaded stepchild of the bridge crew, just sitting on his or her hands as the ship flew along well-established routes between colonies, or transported security troops to one trouble spot or another.