A --- Don’t follow too closely; B ---Keep distance; C --- Accident area; D --- Road closed; E --- Road work ahead; F --- Two-way traffic; G --- One-way traffic; H --- Bend ahead; I --- Bus lane; J --- Electronic toll collection (ETC); K --- Service area; L --- No passing; M --- No parking;N --- Dead end; O --- No horn; P --- Falling rocks; Q --- Slow down at exit; Examples:( Q ) 出口慢行; (M) 禁止泊车; 53 ( ) 单向行驶; ( ) 事故多发区 54 .( ) 电子收费; ( ) 小心岩石滑落 55 .( ) 前方弯道; ( ) 服务区 56 .( ) 保持车距; ( ) 公交车专用车道 57 .( ) 禁止鸣号; ( ) 前方道路封闭