小红盒──高速公路上的露天电话在我国一些现代化高速公路上，每隔半公里就能看到一只桔红色的小方盒，这就是在我国刚刚露面的露天电话。这种电话既看不到电杆，也看不到电线。原来，在高速公路全线境内的纵向中央分隔带下面，秘密而巧妙地埋设有通讯电缆，它连接着设置... Small red box ─ ─ open-air telephones on the highway In some modern highway in our country, every half km you can see a small square orange box, which is just in our country open-air telephone. This kind of phone can not see the electric pole, also can not see the electric wire. It turned out that in the territory of the highway within the vertical central divider below, secretly and ingeniously buried communication cable, which is connected to the settings ...