1、 warning board
Warning 报警，警告...warning board 标志牌，警告牌...Warning buzzer 蜂鸣器（倒车用）
2. signboard
Signal valve 信号阀...signboard 标志牌...signboard illumination 标志牌照明
3. marking board
交通工程学 Traffic Engineering...标志牌 ?marking board...交通标志标线 traffic marking line
4. denoter
标志牌：denoter