It follows reports of drivers speeding in the areas
The warning comes following reports of drivers speeding in the areas between 8.20am-9.15am and 3.10pm and 4pm.
The constabulary says when the school zone signs are illuminated, the 20mph limit is mandatory and enforceable.
These limits, it says, are in place in to keep children safe as they travel to and from school and even a small increase in speed can make a huge difference.
Man who launched attack on van driver sentenced
RNLI's last serving Mersey class boat visits the Island
Double victory for Island's heritage railways
Demolition work to get underway on Douglas high street site