Graphics Programs Reference
In-Depth Information
21. Study the profile and take note of how the
optimization process redesigned it (see
Figure 3-11
).
Figure 3-11:
An optimized profile
Compare this profile with
Figure 3-7
. Notice
how the slopes are all between 0.5 percent
and 5 percent. These were the values you
provided for Required Drainage Grade and
Maximum Grade. Notice also that there is
always at least 500 feet (150 meters)
between PVIs because of the Minimum PVI
Spacing value you provided.
Analyzing Sight Distance
Of course, one of the most important aspects of
road design is driver safety. And one of the best
ways to keep drivers safe is to give them good
visibility. For that reason, a sight distance
analysis is an important part of every road
design. In the past, sight distance analyses have
been time-consuming and expensive. But now
you have an engineering-accurate 3D model
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