What do those TRIANGLES on the road mean? (1 Viewer)

[seremify007]

Has anyone noticed these are popping up on a lot of roads? They usually are in a series (e.g. you are driving forward in a lane, and there are arrows on the right side of the lane pointing left) so I'm inclined to think it means keep to the left/stay in your lane?

*shrugs* They definitely weren't around back when I did my L's!

Any ideas?

 

[Optimus Prime]

The ones on both sides of the lane indicate a school zone is about to start

 

[Havox]

The ones on both sides of the lane indicate a school zone is about to start

That's what I thought but then I wondered why are there triangles near our place nowhere near a school zone.

 

[seremify007]

Also wondering about those which are only on one side of the lane.

 

[SnowFox]

Possibly to say children are near by?

BTW, called Dragons teeth i thnk.