1.   The fifth was chosen for D-Day to allow a safety margin in case the attack needed to be postponed.

2.   This is not part of the project plan but an aid to the project leader in creating one with an adequate safety margin.

3.   And full-time four-wheel-drive adds a safety margin to everyday driving, especially on wet pavement.

4.   And we avoided all careening Vespas by a safety margin of at least six inches.

5.   Advanced communication systems have also improved the safety margin for deep-sea fishing.

6.   Engineers have calculated that even if the two stringers failed, the others can carry the wing load with adequate safety margins, she said.

7.   Global warming may well erase the safety margin for those already living on the economic or ecological edge.

8.   Meanwhile, the space shuttles have flown intermittently, raising concerns that safety margins are eroding.

9.   Most of that swing, which the company started reporting in the first quarter, is pure safety margin, says spokesman Clay Owen.

10.   Research is needed on advanced nuclear systems that use less atomic fuel, are more efficient and have greater safety margins than current ones.