关于改进电话闭塞的研究

Study on Improving the Telephone Blocking

路票作为行车凭证，行车效率很低。因此，提出了以塑料材质的路牌显示来代替路票。同时对路牌的设计、使用和优缺点作了说明。

Taking route tickets as operating proofs makes low operating efficiency. So, it is put forward that plastic signpost show should substitute the route tickets, also, the design, use, advantages & shortcomings of signpost were explained.