FIGURE 1-23.
BYPASS SYMBOLS.
The bypass is considered easy when the obstacle can be crossed within
the immediate vicinity of the bridge by a U.S. 2 1/2-ton, 6x6 truck
equivalent, without work to the bypass.
For example, if the stream is
shallow, with a firm streambed and gentle approaches, it would be considered
easy.
A bypass is considered difficult when the obstacle can be crossed in
the immediate vicinity, but only if some engineer work is done to prepare
the bypass.
A bypass is considered impossible when the obstacle cannot be crossed
anywhere in the immediate vicinity of the bridge or tunnel. The only way to
cross is to repair the bridge or build a new one. If the bridge or tunnel
is destroyed, it will require rerouting of traffic over alternate routes.
1-55
MP1028
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