1.   Afterward, many military installations and key federal buildings were surrounded by concrete barriers.

2.   Concrete barriers surround the race track to protect spectators.

3.   Concrete barriers are used as highway dividers.

4.   As a short-term fix, Customs intends soon to place some large concrete barriers at the bridge entrance on the U.S. side, he said.

5.   Bonneville Dam was the first of the concrete barriers erected on the Columbia.

6.   A concrete barrier separates the northbound and southbound lanes.

7.   A side street is blocked by concertina wire and concrete barriers.

8.   After that attack, the United States expanded patrols around American facilities in Saudi Arabia and installed hundreds of waist-high concrete barriers.

9.   But hurling a car into a concrete barrier is equivalent only to crashing it into another car of the same weight.

10.   Chain-link fences and concrete barriers already surround the site.