There were no hills, only long green mounds of earth planted with shade trees and serving as barriers between traffic and houses.

Interaction between a solitary wild dolphin and marine traffic off the Spanish coast (2005-2006).

That makes an unfortunate linkage between traffic in vulnerable people and illicit booty.

The interaction between trains and other traffic was controlled by men with red flags.

"The difference between highway gridlock and free-moving traffic is the last 5 to 8 percent of cars," he said.

A woman appeared out of the night before Valentine could answer, weaving between traffic with supernatural speed.

Others, idling at the curb, make sure to keep a lamppost between them and traffic.

Some of this route has three lanes, with the passing lane alternating between northbound and southbound traffic.

Some measure of priority and proportional fairness is defined between traffic in different classes.

The relationship between offered traffic and carried traffic depends on the design of the system and user behavior.