I- 93 Environmental Impact Statement
Vanasse Hangen Brustlin, Inc.
This project phase included preliminary design
and environmental impact assessment for a 20-
mile segment of Interstate 93 from the Massachusetts state line to Manchester, New Hampshire. Improvements include the streamlining of
five interchanges, adding park-and-ride facilities
at three exits, replacing or rehabilitating 43
bridges, and reserving enough space in the median to accommodate a future commuter rail line.
The team used core MicroStation functions such
as tags, tag reporting, and batch plotting to manage changes, calculate impacts, and present the
design to the public and resource agencies. These
functions also helped ensure that the changes
made it from the team to the environmental document quickly and accurately.
The design team used 3D tools in MXROAD,
InRoads, and MicroStation to review various
aspects of the design. The 3D tools allowed it to
verify clearances and to provide 3D data to its
noise-modeling expert to help identify where
soundwalls were needed to reduce the noise
impacts on abutters.
Using Bentley technology, the firm identified multiple alternatives so the best option could be selected. More than 42 were assessed. Using traditional
methods, it would have been a
challenge assessing half that
many alternatives. The overall
result was a better design for
the local communities with less
environmental impact. ;
CIVIL ROAD DESIGN
M- 85 Rehabilitation
The M- 85 rehabilitation project is part of the
Michigan Department of Transportation’s five-year
plan that encompasses almost four miles of
improvements. Within the project limits, there are
more than 200 commercial driveways, 40 directional crossovers, 50 minor intersections, 12 signalized
intersections, more than 200 streetlights, numerous
public and private utilities, and an s-curve.
The proposed rehabilitation consists of six to eight
uniform 12-foot lanes, defined driveways, curb
and gutter throughout the project limits, separated
enclosed drainage and auniform median.
Maintaining access to all businesses as well as a
minimum of two lanes of traffic at all times required
Wade Trim cdesigned the intersections and
crossovers throughout the M- 85 corridor using the
modeling capabilities of Bentley’s InRoads, creat-
ing a complete proposed surface model. The high
level of detail in the surface model allowed more
detailed and accurate earthwork calculations.
The 3D surface model also proved to be an effec-
tive method of placing the detail grades into the
plans using the drafting notes from InRoads.
The drafting note tools saved a minimum of four
hours per sheet on the detail grades for two submit-tals. This project had more than 25 detail grades
sheets, so Wade Trim saved over 25 days of CAD
and engineering time using the drafting tools. ;