Two new safety measures are being trialled through Japanese school uniforms.

Authorities are taking special steps to protect pupils by making their uniforms knife-resistant. The slash-proof sweatshirts and coats, made from the same Kevlar-type materials used in bulletproof vests, are being introduced in response to two school knife attacks in the past year.

They have been specially crafted in small sizes, can be embroidered with a school logo and come in a range of 12 cheerful colours.

Children are also being tagged with RFID chips in an attempt to monitor their safety on the way to and from school.

The RFID chips have been designed to be placed in bags or clothing and are currently being tried out by a Wakayama school to prevent children from wandering off site.

The tags — similar to those used for merchandise at retailers and wholesalers for inventory control — will be attached to students' school bags or nameplates.

Tag readers will be installed at the school gate and locations the parents and teachers think could be dangerous. The readers will log the times students pass through the gate and alert the school when they approach designated "dangerous" premises.