CITROEN Grand C4 PICASSO Owner's Handbook Manual page 166

Driving
Displays
Once the system has been activated and the speed conditions are met, a symbol is displayed in the instrument panel.
Symbol
164
Associated message
No vehicle detected by the radar.
A vehicle is detected but the inter-vehicle time is more than 3 seconds. No value is
displayed.
A vehicle is detected. The inter-vehicle time is 3 seconds or less. The minimum value
displayed is 0.5 seconds, even if the true inter-vehicle time is lower.
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