Traffic congestion on urban road networks has been recognized as one of the most
serious problems with which modern cities are confronted. It is generally anticipated that
Dynamic Route Guidance Systems (DRGS) will play an important role in reducing urban
traffic congestion and improving traffic flows and safety. One of the most critical issues
in designing these systems is in the development of optimal routing strategies that
would maximize the benefits to overall system as well as individual users.
Infrastructure based DRGS have advantage of pursuing system optimal routing strategy,
which is more essential under abnormal traffic conditions such as non-recurrent
congestion and natural disaster. However user compliance could be a problem under
such a strategy, particularly when some of equipped drivers are urged not to choose
minimum travel time path for the sake of improving the total network travel time. On the
other hand, In-vehicle based DRGS can utilize the user-specified route selection criteria
to avoid "Braess Paradox" under normal traffic conditions. However, it may be of little
use under abnormal traffic conditions and high DRGS market penetration.
next to an author's name indicates that all files or directories associated with their ETD are accessible from the Virginia Tech campus network only.
![[VT]](http://scholar.lib.vt.edu/images/ETD-db/restricted.gif)
