Civil Engineering Reference
In-Depth Information
effective enforcement of speed limit
providing traveler information on work zone locations and times
15.6 Information Technology (IT)
Each metropolitan area needs to establish an IT architecture that enables the
monitoring of nonrecurring events, and provides real-time information to travelers
on (1) incidents that cause major bottleneck delay (intensity, extent, and duration);
(2) work zones; (3) road weather; (4) alternate route/travel modes.
15.6.1 Active Traffic and Demand Management (ATDM)
Application of Active Traf
c and Demand Management (ATDM) strategies enables
the system operator to manage incident impacts by a number of strategies aimed at
real-time coordinated management of traf
c controls, lane assignments, traveler
information, etc. ATDM comprises a series of strategies (e.g., traf
c
management centers, managed lanes, rapid incident response) to dynamically
manage roadways and corridors in response to non-recurring sources of congestion
[
6
]. These include:
>
Queue warning display systems
: to warn drivers of the presence of congestion
downstream;
>
Dynamic routing and traveler information
: the use of dynamic message signs
to display rerouting instructions in response to non-recurring congestion events; and
>
Dynamic lane markings
: the delineation of lanes to manage traf
c sensors, traf
c
fl
ow pat-
terns created by the above strategies.
15.7 Examples of Best Practice
Over the last 15 years, many states in the US, have built transportation management
centers, deployed intelligent transportation systems (ITS) over critical segments of their
road networks, deployed safety service patrols (using HELP vehicles), and developed
interagency arrangements to both incident management and traveler information.
15.7.1 Institutional Best Practices
Examples of institutional best practices adopted by several states are summarized in
Table
15.2
.
