(immediate vicinity; work or effort) (3-66)
The Symbol for a bypass impossible is
. This situation means that the obstacle can only be crossed by one
of the following methods:
1. Repair of item; e.g. bridge.
2. New construction.
3. Detour using alternate route which crosses the obstacle some distance away.
When an obstacle requires extensive repair or construction or a long detour, it is classed as a
(clearance; width; underlined) (3-96)
The tunnel symbol, like the underpass symbol, shows the basic shape of the restriction, overhead clearance and
width. However, the tunnel symbol also shows the length of the tunnel, serial number, bypass conditions, and is
drawn with an arrow extending to the map location.
This tunnel symbol represents