Home / Standards / GB/T 34428.3-2017 GB/T 34428.3-2017 Active Communication rules of the devices of surveillance and control system for expressway—Part 3：LED changeable message sign 高速公路监控设施通信规程 第3部分：LED可变信息标志 Standard Type GBT ICS 93.080.30 CCS R87 Status 现行 Issue Date 2017-09-29 Implementation 2018-04-01 Responsible Dept 国家标准委 Drafting Unit N/A