Other information:
Limitations Of The Navigation system
GPS Signal Reception State
As the GPS satellite frequency is received/transmitted in
straight lines, reception may not work if hiding devices are placed on
or near the GPS antenna or when traveling through the following
locations.
•
Tunnels
...
A vehicle which moves into your
lane from an adjacent lane cannot
be recognized by the sensor until it
is in the sensor's detection range.
The sensor may not detect immediately
when a vehicle cuts in suddenly.
Always pay attention to the
traffic, road and driving conditions. ...