Article on etcs and japanese system for signalling

https://www.hitachihyoron.com/jp/pdf/2014/09/2014_09_05.pdf?copilot_analytics_metadata=eyJldmVudEluZm9fbWVzc2FnZUlkIjoiQUJyYVh5cUoxbXVkQ1dMSDFjSkxzIiwiZXZlbnRJbmZvX2NsaWNrU291cmNlIjoiY2l0YXRpb25MaW5rIiwiZXZlbnRJbmZvX2NvbnZlcnNhdGlvbklkIjoiTTEyUjVhdFR2UmZ1UTVhZmUyUHlFIiwiZXZlbnRJbmZvX2NsaWNrRGVzdGluYXRpb24iOiJodHRwczpcL1wvd3d3LmhpdGFjaGloeW9yb24uY29tXC9qcFwvcGRmXC8yMDE0XC8wOVwvMjAxNF8wOV8wNS5wZGYifQ%3D%3D&citationMarker=9F742443-6C92-4C44-BF58-8F5A7C53B6F1

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