本文件规定了一项附加的SIRI功能服务，用于在监控系统和包含实时公共交通车辆或行程时间数据的服务器之间交换有关设施可用性变化的信息。其中包括交通运营商的控制中心，以及提供乘客出行信息服务的信息系统。至于跨模式，公共交通方式包括新的交通方式（车辆共享、车辆合用等）。购买本文件时可获得的所有当前修订均包含在购买本文件中。

This document specifies an additional SIRI functional service to exchange information about changes to availability of facilities, between monitoring systems and servers containing real-time public transport vehicle or journey time data. These include the control centres of transport operators, as well as information systems that deliver passenger travel information services. As for Transmodel, public transport modes include new modes of transport (vehicle sharing, vehicle pooling, etc.).All current amendments available at time of purchase are included with the purchase of this document.