"Security zone communities," created by traffic barricades within existing urban areas, are more embattled and middle class.

Perched on a concrete traffic barricade, the roar of the jail barge generators filling the air, Mr. Alvarez considers himself lucky.

Near East 125th Street, Jerry Ayala was fishing under the Triborough Bridge as two people slept on the grass next to the traffic barricade.

A traffic barricade is a type of barricade fitted with flashing lights and used to block excavations or road construction or other safety-related purposes.

Patients arriving for cancer treatments at Memorial Sloan-Kettering Cancer Center had to park several blocks away because they could not get around traffic barricades.

The term "robotic bollards" has been applied to traffic barricades capable of moving themselves into position on a roadway.

Not much out here-a couple of concrete traffic barricades, some concrete trash cans, a few directory/advertisement kiosks.

Last summer's empty containers for bleach, spring water, dish detergent, antifreeze, baby wipes, cat litter and motor oil have come back to New York streets this fall as traffic barricades.

It's a flat, diagrammatic painting in black and white of a striped traffic barricade with sharply defined arrows pointing in opposite directions.

Between them was a metal and wood wall similar to a traffic barricade on a dead-end street.