School zone limit of 40kmh is round the clock ?

or is only during school hrs, Sundays & PH are incl as well.

i think only some area the speed is 40 km/h the rest is 50km/h.

http://driving-in-singapore.spf.gov.sg/

http://www.todayonline.com/singapore/school-zone-speed-limit-lowered-40kmh-pilot-programme