Dumb question: will a lateral vent prevent a backup event inside the home?

[EIR]

I have what I believe is a lateral vent at grade in my front yard. Public sewage. It's open to atmosphere (metal mushroom type cover). It's about 6 feet from the foundation.

If I were to experience a clog between the main and lower part of the lateral before the vent or a clogged main in the street it would spill over into the yard before continuing up into the house? (Rancher on crawlspace).

 

[Smooky]

If the sewer backs up it is designed to leak out in the yard instead of backing up into your house.
Called a sewer popper.

http://www.jonesstephens.com/product/s62304/