Another possibility would be alarms that sound when someone crosses the yellow danger line.
Back came the hosts and they came close to an equaliser soon after the interval as Samba nodded on a long throw and would have found the net had it not been for the well-positioned substitute Yuri Zhirkov, who cleared the danger from the line.
He lofted an effort towards goal with the Mexico keeper stranded out of position, but Francisco Javier Rodriguez was perfectly positioned on the line to clear the danger.
Georgetown lost in the Big East semifinals and settled for a No. 2 as well, but Indiana was in no danger of dropping off the top line, despite its loss to the Badgers.
One answer to that is gerrymandering which makes for safe districts for incumbents who toe the line and pose a danger for any Congressman who engages in compromise to get something done for the greater good.
Dr Dixon, who heads the NHS Alliance - an organisation which represents doctors, nurses and managers on the front line - said the danger with the current wording of the rules was "that it seems to put a duty upon the commissioner to go for competition with all contracts that are made".
The bottom line is that the radiation danger diminishes by half every 30 years.
The little Nottingham Forest striker again went close as he nipped in behind the Germany centre-backs, but keeper Robert Enke came smartly off his line to snuff out the danger.
McFadden's 68th-minute free doubled Donegal's lead although the Ulster county had a scare seconds later when goalkeeper Boyle almost dropped a high ball over his own goal-line before Eamon McGee averted the danger.
He has also taken a hard line towards Iran, repeatedly warning of the danger to the international community of allowing it to develop nuclear weapons.
But I've been assured by firefighters that they have a defensible line around it and it's not in danger right now.
In telecommunications, mobile phones have for years been disrupting the incumbent fixed-line providers, but now they themselves are in danger of overshooting.
Kirkland scrambled after the ball and eventually cleared the danger while a disbelieving Rooney appealed in vain that it had crossed the line.
Gopperth kicked a penalty from out wide but Wasps almost added another try when a line-out ball bobbled dangerously but Alex Tait cleared the danger.
They think the only way to really draw a line under the crisis is for Spain to be taken off the danger list.
The puck got behind Nabokov and sat on the goal line before Andrew MacDonald used his hand to swat it out of danger.
If ever there was an example of an imminent, urgent humanitarian danger, we believed that this was very much -- was very much in line with that.
And we know that when we need you most, you'll be ready to dash into danger, to protect our lives, even if it means putting your lives on the line.
In contrast, when the price deviated significantly above the pink income valuation line, as it did by the beginning of calendar year 2007, the real danger of overvaluation is vividly expressed.
Whitehead capitalised on Smith's failure to clear the danger caused by Sykes' grubber kick, stretching out to get the touchdown inches from the dead-ball line.
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