The phrase "a flashing yellow light" is correct and usable in written English.
It can be used to describe a traffic signal or warning light that is yellow and flashing, indicating caution or a need to slow down.
Example: "As I approached the intersection, I noticed a flashing yellow light, signaling me to proceed with caution."
Alternatives: "a blinking yellow light" or "a yellow warning light".
The crew had set up a flashing yellow light on one track to warn oncoming trains that they were working.
But Edwards cast a flashing yellow light today on an offense that had been seeing nothing but green.
Her book functions more as a flashing yellow light at an intersection: slow down, be alert — pay attention to what serious differences may mean to a close relationship.
While this would goose profits in the short term, it would be a flashing yellow light because the high end of the tech market is disproportionately profitable.
"Our study is a flashing yellow light," he said, a warning to the church to pay more attention to the young.
Mr. Baby was placing a flashing yellow light in the tunnel just south of the Canal Street station to warn train operators that workers were on the tracks when he was hit, Mr. Figueroa said.
The fact that Governor Romney will not disavow or denounce Mourdock, Limbaugh and their ilk speaks volumes and should be a constantly flashing yellow light as we prepare to enter the voting booth.
In fact, some prominent American church leaders expressed confidence in recent weeks and days that what they would receive from the Vatican would be a kind of flashing yellow light that left room for negotiation down the road and perhaps allowed them to pursue their policy on an experimental basis.
Flashing yellow light, Zuck!
Weather buoys can be recognized by their yellow color and flashing yellow light at night, and range in diameter from 1.5 m to 12 m.
The enemies of individualism, and the genuine difficulties - psychological more than economic - that individualism creates for the less successful members of society, dictate another flashing yellow light.
