The blazes could signal a difficult fire season ahead.

NPR: Fire Forces Evacuation Of Campus, Homes In Calif.

Services to Heathrow Airport were suspended and First Great Western trains were cancelled after a fire damaged signal equipment on Thursday.

BBC: Paddington rail service returns to normal

Plano, Texas was able to serve 7.5 square miles per fire station with signal preemption, compared with 5.6 square miles without it.

FORBES: Magazine Article

Plano, Tex. was able to serve 7.5 square miles per fire station with signal preemption, compared with 5.6 square miles without it.

FORBES: Magazine Article

Now random phrases and images came at me the sudden quick-fire assaults that signal a new idea and I knew that they would come in sequence soon enough, their predestined rhythms would assert.

NEWYORKER: Fjord of Killary

Instead, stick the probe in, place it on the fire and wait for the audio signal that the food is cooked.

FORBES: Magazine Article

If you aim it at them and set some of them on fire, it's not a signal any more.

CNN: What Mayer misses on work-life balance

Withdrawing from Syria would ensure the safety of the team, but it could signal a loss of confidence in the hopes of a cease-fire and leave the U.N. without a way to monitor progress, the report says.

CNN: U.N. head outlines options for Syria mission