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OCR for page 19
19
shoulder use application when the shoulders are less than
12 ft wide. The accident rate increase was greatest for the
first 2 years (up to a 60% increase) and tended to level off
at 10% to 15% higher than unaltered conditions after the
first 2 years.
INTELLIGENT TRANSPORTATION SYSTEMS
The potential benefits of driver assistive technology are cur-
rently being researched by the University of Minnesota. Their
research is aimed specifically at making it easier and safer for
Metro bus drivers to operate on narrow shoulder lanes. The
research is addressing virtual mirror and virtual bumper sys-
tems, as well as the lane keeping assist concept. It is a global
positioning system-based approach. Magnets embedded in
the roadway pavement are another technology approach that
FIGURE 13 I-66 shoulder lane use control sign and signal
is under development for the lane keeping assist concept. (Fairfax County, Virginia).
Other ITS technologies of potential application for BBS lane
use include incident monitoring systems and variable mes-
sage signs. Virginia's DOT currently uses overhead message blockages and also to mainline freeway travel speeds. The
signs to advise motorists on I-66 as to when shoulder lanes are latter could provide a consistent definition for buses shifting
open for general purpose traffic use (see Figure 13). Incident to shoulder use running. ITS signage could alert motorists to
monitoring systems could alert bus drivers to shoulder lane shoulder bus operations.
