  A framework is proposed to assess the safety of maintenance work zones in a
timely manner, show whether there are safety hazards, whether adjustments need
to be made and how to adjust it. By means of advanced data acquisition
technologies such as multi video detection and portable device based
naturalistic driving, the microscopic vehicle behaviour data can be collected.
Based on this data, a method for expressing and displaying the distribution of
unsafe vehicle behaviour is used to show whether safety hazards exist. Using
Vissim, the impacts of the length and speed limit of the warning area, the
length and type of the upstream transition area and the length of the work area
of the maintenance work zone on the distribution of unsafe vehicle behaviour
are simulated to establish the safety correction matrix, which can tell
maintenance departments the direction of adjustment when safety hazards exist
in maintenance work zones.
