Keep a lookout for the red lantern signal

[Silverobama]

I usually can hear parents talk with their children in English in my city. I think it's because we begin to learn English when we are very young and parents are demanding, hoping that their kids can speak fluent English as soon as possible.

Today when I was standing at the intersection waiting for the light to turn green (usually there's a sign of human which tells people to cross the road), I heard a mom say to his child who was about to cross the road without noticing the light.

Keep a lookout for the red lantern signal.

Is it natural to say this?

 

[Rover_KE]

No — delete ‘lantern’.

NOTE: moms are usually female, so ‘… her child’.

 

[Silverobama]

No — delete ‘lantern’.

NOTE: moms are usually female, so ‘… her child’.

Hi Rover. I wonder if native speakers would say to their kids or someone who's trying to cross the road but without noticing the red light this.

Keep a lookout for the red signal.

Could you please tell me what a native speaker would use?

 

[emsr2d2]

I usually can often/frequently hear parents talking with their children in English in my city. I think it's because we begin to learn English when we are very young and parents are demanding, hoping that their kids can will [learn to] speak fluent English as soon as possible.

Today, when I was standing at the intersection waiting for the light to turn green (usually there's a sign of human person-shaped light which tells people to they can cross the road), I heard a mom say the following to his her child, who was about to cross the road without noticing the light.

Keep a lookout for the red lantern signal.

Is it natural to say this?

Note my changes to the top half of your post. Your sentence isn't natural. We'd say either "Wait for the little green man" (note that that's the phrase used in BrE to refer to that light shaped like a person), or "Don't cross now. The pedestrian light is still red".