Interactive Localisation System for Urban Planning Issues - Efficient Decision Support Systems: Practice and Challenges from Current to Future - page 472

To test the net, in the first example it is considered one single “ambulance base”, located in
node E in the centre of the city (Figure 9). The access time is considered on the most distant
nodes (net perimeter). In this first case, the maximum access time is at node 14, with 492
seconds, while for node 5 it is 468 seconds.
Then two emergency basis (E1 and E2) have been located (Figure 10). The maximum access
time is at node 12, with 358,5 seconds.
Locating 3 basis (E1, E2 and E3), the system gives a general lower access time but, even
moving the basis in every suitable place, for the further node it is impossible to decrease the
access time lower than 302 seconds. In view of reaching a better result, four bases are
situated considering all the possible locations. Comparing the different possibilities, with
the best location choice, the maximum access time to node 13 with 220 seconds.
Fig. 11. Four emergency basis - influence areas and ridge lines
6. Discussion
The proposed model is an example of specific technical tools that planners can use to get fast
and cheap outputs of localisation hypotheses during the first phases of planning processes.
Urban planning process is extremely complex and when planners define the main structure
of the plan, they need to verify the order of magnitude of the mass of parameters that are
involved in the process. This operation is functional if planners can execute it by themselves.
More specific analyses are required in other phases, after the main idea is defined.
ULISSE offers a simple way to calculate the impact on traffic due to location decisions (as
well as localisation opportunities with given accessibility requirements) and can be
considered as a tool of a comprehensive Decision Support System for urban planning
decisions about location problems.