Specification for light - emitting diode changeable message signs of expressway 公路led可變信息標(biāo)志技術(shù)條件
Message display and management of changeable message signs for expressway 高速公路可變信息標(biāo)志信息的顯示和管理
Communication rules of the devices of surveillance and control system for expressway - part 3 : changeable message sign of led 高速公路監(jiān)控設(shè)施通信規(guī)程.第3部分: led可變信息標(biāo)志