  Robots and Humans have to share the same environment more and more often. In
the aim of steering robots in a safe and convenient manner among humans it is
required to understand how humans interact with them. This work focuses on
collision avoidance between a human and a robot during locomotion. Having in
mind previous results on human obstacle avoidance, as well as the description
of the main principles which guide collision avoidance strategies, we observe
how humans adapt a goal-directed locomotion task when they have to interfere
with a mobile robot. Our results show differences in the strategy set by humans
to avoid a robot in comparison with avoiding another human. Humans prefer to
give the way to the robot even when they are likely to pass first at the
beginning of the interaction.
