Viva Series, Roads - General 1194
43.7.7 Road - Extension of the Centreline
Description Whenever centrelines must be extended, for example, at the start and end area of an align-
ment or slope. The projection of the measured position to the centreline is made using the
tangent of the start/end point of the centreline.
In this case a warning appears informing that the original design is exceeded. The application
will advise as soon as a measured position is within the design area once again.
Concept When expanding the centreline the geometry will be continued using the tangent of the
start/end point of the centreline.
Method Description
When staking out in the region of the start/end area of the design centreline, situations
occur where an expansion of the centreline is useful. As soon as measurements are outside
the defined centreline, the application will prompt if, and with which method, the centreline
should be expanded.
)
The extension of a centreline is made following its start/end tangent. Outside of the original
design area correct results cannot be guaranteed.
a) Centreline
b) Extended centreline
b
a
Road_090
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