are in meters. If sidewalks are present, they are indicated on the symbol.
They may be used for the emergency passage of wider vehicles. The width of
the traveled way is written first and is followed by a slash and the total
width with the sidewalks.
In structures with arched ceilings and a
resulting decrease in clearance, both minimum and maximum clearances are
noted.
You do this by noting the minimum clearance, a slash, and the
maximum clearance.
i.
Tunnels. Tunnels usually have data posted for them in the same
manner as bridges.
The essential information for a tunnel includes its
serial number, location, overhead clearance, length, width, and bypasses.
Engineer personnel will conduct detailed tunnel reconnaissance using a
specific form.
For MP purposes, limited tunnel information is recorded.
Figure 1-21 illustrates some tunnel symbols.
An arrow is drawn from the symbol representing the entrance to
the tunnel.
In the case of a long tunnel, both entrance and exit are
located by splitting the arrow. The serial number of the tunnel is placed
inside the symbol. The width of the traveled way in meters is placed below
the symbol.
If the tunnel has sidewalks, the traveled way information is
followed by a slash and then the overall width of the tunnel. The overhead
clearance is placed to the left of the symbol. As with an underpass, if the
minimum and maximum clearances are different, they are divided by a slash.
The total length of the tunnel is placed to the right of the symbol. All
measurements are in meters. Any information that is unknown is indicated by
a question mark.
j.
Bridges. Information pertaining to bridges was discussed during
the discussion of the route classification formula beginning on page 1-31.
The symbol for bridge information is the same as that described for the
various signs, with one addition. From the symbol containing the data for
the bridge, you extend an arrow to show its location.
Although the engineers are charged with deliberate bridge recon
responsibility, any additional information that you can add is helpful. It
should be included on an attached sheet. The engineers use DA Form 1249,
Bridge Reconnaissance Report, for bridge recon. Information that you might
gather, should time and conditions permit, might include the type of bridge,
the number of spans, the length of the spans, and the type material used in
construction and surfacing.
Types of bridges, and other pertinent bridge
data, are included in FM 5-36 Chapter 9. Figure 22 illustrates some of the
major bridge types.
1-51
MP1028
Previous Page
