When Effective
School zone speed limits are often, but not always, only applicable during posted weekday hours near the beginning and ending of school when children are likely to cross roads. In some jurisdictions, the school zone speed limit is effective at all times when school is in session, plus additional time before and after the school day. Flashing amber lights often indicate when the school zone is effective. When a school zone also has a large playground facility, it may double as a playground zone and the speed limit could be in effect longer — or even continuously.
In California, school zones are generally in effect only "when children are outside or crossing the street", and usually have a speed limit of 25 mph, or 40 km/h. School zone signs are sometimes amended with the notice "When children are present" (like shown on the photo) which emphasizes its definition in the drivers handbook.
School zones may also sometimes be in effect during school holidays, due to holiday programs that use school premises. In some locations however, school zone signs will be locked up during school holidays so that motorists can drive to the normal speed limit.
School zones typically have speed limits between 15 and 25 mph (25 and 40 km/h).
Overtaking moving or stationary vehicles in active school zones is prohibited in some jurisdictions.
Read more about this topic: School Zone
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