Not a good idea to delete* it, because then it won't show ANY speedcams. OP wanted only School Zones to be removed. So one way** to do it is to make only that alert type transparent.
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* Deleting works on the file not part of it; so it doesn't make sense. If you choose to delete the file, you will get unwanted issues
** Not a good way to do it since it will be a "permanent" solution. The correct way is to set it in sys.txt (like I already said)
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