Incident management: berekening van de effecten van lokaties voor hulpdiensten
en de inrichting van procedures m.b.v. een simulatiemodel.
Report 94.3.LT.4333, Transport Engineering and Logistics.
In this project the possibilities of decreasing the incident duration were
studied. As a result of decreased incident duration, the effects of incidents
(congestion) will also reduce. The solution has been found in the procedure of
incident dispatching on the highway network.
The current incident restoration system can be improved by applying alternative
strategics within the dispatch procedure, namely:
To estimate the effects of incidents with different procedures, a simulation
model was build. To locate extra emergency vehicles a location model was
- assigning of emergency services based on the shortest traveltime,
- allowing the towtrucks to drive on the shoulderlane,
- use extra emergency vehicles.
The simulation model simulates the dispatch of incidents on the highway
network. Different dispatch procedures can be used as input. By adjusting the
simulation like the current incident restoration system, it is possible to
compare the values of the performance-indicators with reality. In the casestudy
"Vlag van Utrecht" the comparison was acceptable.
New situations were also tested with the simulation model. The results are
obvious better when the towtrucks are allowed to drive on the shoulderlane in
case of congestion. The traveltime is strongly decreased. This has a positive
influence on the incident duration. As a result of the reduced incident
duration, the length, duration and weight of congestion will also be reduced.
Assignment based on the shortest traveltime produces less result.
The location model determines the location of emergency vehicles on the
basis of incident chances and the shape of the highway network. In the
casestudy "Vlag van Utrecht" the junction Oudenrijn is the most
acceptable location for one extra emergency vehicle (towtruck). The model
showed the same result. Placing more emergency vehicles the locations will
be chosen in the network with a good dispersal. The maximum number of
centrepoints of the network is fifteen. This can be seen as a disadvantage.
Conclusion: the results of the casestudy are satisfying. That's why other
it is recommended to study other areas in a similar way.
Reports on Transport Engineering and Logistics (in Dutch)
, TU Delft