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the left lane because there is no target vehicle. These
ranges and behaviors are presented as rules to make
sure that only reasonable use cases will be generated.
6 CONCLUSIONS
In this article, we propose an ontology-based appro-
ach for the generation of use cases with a hierarchy
in three layers: basic layer, interaction layer and ge-
neration layer. We built three ontologies for the con-
ceptualization and characterization of the components
of use cases: a highway ontology and a weather on-
tology to specify the environment in which evolves
the autonomous vehicle, and a vehicle ontology which
consists of the vehicle devices and the control actions.
Relationships and rules, such as traffic regulation, are
expressed using a first-order logic.
An autonomous vehicle is a safety-critical system
for which all behaviors must be predictable. The-
refore, the generated use cases need to be modelled
with a semantically explicit formal language to im-
prove their reliability and robustness. In the future,
we are interested in the formalisation of these use ca-
ses considering also the time factor.
ACKNOWLEDGEMENTS
This research work has been carried out in the fra-
mework of IRT SystemX, Paris-Saclay, France, and
therefore granted with public funds within the scope
of the French Program “Investissements d’Avenir”.
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