So, I've seen a movie years ago. Don't remember much, just the fact that something happens and there are only a few survivors. At some point they drive a car, and stops at traffic light. One woman answers that she did that so, when she will have children to be educated.

If it was having them stop before crossing the street...

Night of the Comet (1984)
From Wikipedia: ***SPOILER~END OF MOVIE***
Eventually, rain washes away the red dust, leaving the world in a pristine condition. With Reggie pairing up with Hector and the other two being just kids, Sam feels left out. When she ignores Reggie's warning and crosses a deserted street against the still-operating signal light, she is almost run over by a sports car driven by Danny Mason Keener, a teenager about her own age.

Night of the Comet - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Night_of_the_Comet)

EDIT: I found the quotations at IMDb:
Samantha (http://www.imdb.com/name/nm0549526/?ref_=tt_trv_qu): [calling across the street to the others after Regina pushes the crosswalk button] What are you waiting for?
Hector Gomez (http://www.imdb.com/name/nm0000296/?ref_=tt_trv_qu): We're waiting for the light to change.
Regina Belmont (http://www.imdb.com/name/nm0829252/?ref_=tt_trv_qu): We DO NOT cross against the light!
Samantha (http://www.imdb.com/name/nm0549526/?ref_=tt_trv_qu): [looks at the red crosswalk light] Are you nuts, Auntie Regina?
Regina Belmont (http://www.imdb.com/name/nm0829252/?ref_=tt_trv_qu): [sighs] You may as well face the facts, Samantha: The whole burden of civilization has fallen upon us.
Samantha (http://www.imdb.com/name/nm0549526/?ref_=tt_trv_qu): What's that supposed to mean?
Regina Belmont (http://www.imdb.com/name/nm0829252/?ref_=tt_trv_qu): It MEANS we do not cross against the light!
Samantha (http://www.imdb.com/name/nm0549526/?ref_=tt_trv_qu): [walks out into the street] That's totally stupid! There's nobody here! See! We're talking ghost town!
Regina Belmont (http://www.imdb.com/name/nm0829252/?ref_=tt_trv_qu): [convertible comes speeding around the corner, Samantha jumps out of the way to avoid getting hit, Regina says to Brian] See what happens?
Danny Mason Kenner aka DMK (http://www.imdb.com/name/nm0691563/?ref_=tt_trv_qu): [convertible turns around and comes to a stop by Samantha] Gawd! I'm sorry, but you shouldn't cross against the light like that.


http://www.imdb.com/title/tt0087799/?ref_=ttqt_qt_tt