Operating Systems
Windows Vista
Windows Vista x64
Windows XP Professional (SP2 or later)
Windows XP Professional x64
(Windows NTand Windows 9x series and Windows 2000 are not supported)
NOTE: You should already have installed:
Bentley.MicroStation.v8i.XM.v8.11.05.17

The Bentley InRoads family of civil engineering products is the central
design solution on many major civil engineering and transportation
projects. InRoads offers consistent, discipline-specific design
functionality on your choice of AEC platform: MicroStation or AutoCAD.
Powerful and versatile, InRoads applications can be used to address
a broad array of project needs, from rapid evaluation of impacts during
preliminary phases to final design and plans production. They are
particularly suited to multi-modal design and situations with complex
transitions and curves.

http://www.bentley.com/en-US/Products/InRoads+Suite/