A—School Zone B—Vendors Prohibited C—Pass on Left D—Don't Step On E—Keep Away for Safety F—Service Area G—Administrative Area H—Watch Your Hand I—Please Don't Leave Valuables Unattended J—Maintenance in Progress K—Out of Service L—Stand on Right M—Break Glass in Emergency N—Don't Touch O—Keep Clear of the Door P—Don't Exceed Speed Limit Q—Icy Road 53 、 ______ 当心夹手 ______ 请勿登踏 54 、 ______ 服务区 ______ 勿靠车门 55 、 ______ 严禁超速 ______ 正在检修 56 、 ______ 前方学校 ______ 靠右站立 57 、 ______ 路面结冰 ______ 紧急情况击碎玻璃