A — Don't follow loo closely J — Electronic toil collection ( ETC) B— Keep distance K — Service area C一 Accident area L — No passing D-- Road closed M — No parking E — Road work ahead N_Dead end F — Two-way traffic 0 — No horn G — e way traffic P — Falling rocks H—Bend alwad Q — Slow down at exit 1 — Bus lane Examples : (Q) 出口慢行 (M) 禁止汽车 1.( ) 单向行驶 ( ) 事故多发区 2.( ) 电子收费 ( ) 小心岩石滑落 3.( ) 前方弯道 ( ) 服务区 4.( ) 保持车距 ( ) 公交车专用道 5.( ) 禁止鸣号 ( ) 前方道路封 闭