>Are the signs not delimited by day of week, time and month where you are?
Depends on the locale. A lot of places just say "Speed Limit is X When Children Present", or "Speed Limit is Y when Lights [on the sign] are Flashing".
Yeah I've seen many such signs and it seems like the clear best approach. People should drive carefully around crowds of children and normally otherwise, regardless of some schedule posted on a given school's website.
Depends on the locale. A lot of places just say "Speed Limit is X When Children Present", or "Speed Limit is Y when Lights [on the sign] are Flashing".