Fiat 500X 2018 Owner's Manual page 152

150 SAFETY
Small Vehicles And/Or Not Aligned To The Lane
The system is not able to detect the presence of vehicles
that are in front of the car but placed outside the field of
action of the radar sensor and could therefore not react in
the presence of small vehicles such as bicycles or motor-
cycles.
Small Vehicles And/Or Not Aligned To The Lane
Lane Changing Of Other Vehicles
Vehicles that suddenly change lane, while standing in the
traffic lane of their car and inside the field of action of the
radar sensor may cause the intervention of the system.
Lane Changing Of Other Vehicles