All down: When farm commodities are uniformly depressed, that's a warning light flashing.
It remains true that the U.S. economic recovery is tepid, that hefty expectations are built into many of the stocks that have started 2013 the strongest and that a pickup in equity mutual fund inflows could be just as much a warning sign as a green light.
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We loved a feature where the rear view mirrors displayed a little orange light, warning us when an object was in our blind spot.
Last month the Commons Education Select Committee issued a damning report into the plans, which it described as a "red light" warning over the changes.
And under International Civil Aviation Organisation regulations, any structure over 45 metres tall on a flight path or near an aerodrome must be fitted with a medium-intensity aircraft warning light.
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Last week a report from the Commons Education Select Committee issued a "red light" warning to the government, urging it to slow down and rethink its proposed changes to GCSEs and the exam system.
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It said it wanted a "traffic light" warning system for drugs - with green for those safe to take and drive, amber for caution and red signalling severe adverse effects which would dangerously impair driving.
Economists would say the rising prices are like the check engine light coming on on the dashboard, and to lift the gas tax would just put a piece of black tape over the warning light.
President Obama even made a light-hearted reference to Mr Netanyahu's warning of a "red line" with Iran's nuclear programme.
He called for an education campaign warning people of the risks of UV light and said there was a need to look at the access to salons and the regulation and use of the sunbeds.
The maker of light emitting diodes, or LED, drivers, issued a second-quarter warning, lowering its revenue projection.
For example, I emailed the company several weeks ago asking why it was still doing business with Light Impressions, a supplier of archival framing and storage materials which has a consumer warning from the Better Business Bureau and is the subject of multiple complaints on various photography Web sites.
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Hamilton said he had been told by the team that the red light was on at the end of the pit lane, but that the warning came "a little bit late".
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