conditions. Note that the first number specifies whether it is in feet or
meters. If you had been directed to check a route for double flow traffic,
an obstruction (OB) would exist. The traveled way of 20 ft is sufficient
only for single flow traffic.
This formula indicated a limited all weather route (Y)
that has a traveled way of 6.7 meters.
It has a military load
classification of 30.
meters. There is at least one obstruction present. The overlay would have
to be consulted to determine what it is.
The route is also subject to
regular, repeated, and serious flooding.
In this example it is a limited all weather route (Y)
with a width of 7 meters. It has a military load classification of 50. The
overhead clearance is 4.6 meters.
Meters were specified as the unit of
measure in the road width. It has an obstruction. The obstruction in this
case may be that it is not suitable for double-flow traffic.
This formula describes an all weather route (X) that
is 10.5 meters wide. Therefore, it is suitable for double-flow traffic of
both wheeled and tracked vehicles. The military load classification is the
however, at least one obstruction; it is subject to closing by regular,
serious snowfall. This could well describe one of the major roads through
in addition to being in FM 19-4 and FM 5-36, is explained in FM 19-4
Now you may understand why this is a most helpful tool when
conducting a route recon and was included in the equipment checklist.
Road Maneuver Network Classification.
Just as a specific route is given a classification, it is
often helpful for the planners to group a series of routes together. For
large and/or long moves, this allows the planner to route various columns
quickly without having to follow each individual route for a specific type
The routes are grouped into a network and assigned a
classification based on the lowest route classification in the group. Three
general groupings are normally used for this purpose; average (class 50),
heavy (class 80), and very heavy (class 120).
The road network, when
grouped in this way, will normally be made up mostly of average routes,
several heavy routes, and a few very heavy routes.