أنشئ حسابًا أو سجّل الدخول للانضمام إلى مجتمعك المهني.
There are some important points to be adopted by (the engineer - company) in question before the implementation of the bridge or the tunnel and how to choose one of them !
A tunnel is usually underground structuraly supported by the sidewalks between which the service road or way is constructed.
A bridge is usually pin supported along its lengths and is usually exposed.
