How does Google Maps Navigation know you are in a tunnel when it switches to night mode?

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                          I suppose this isn't exactly a new feature but it is new to me since I don't travel through tunnels very often.  What exactly is the software using when it decides to switch over to night mode when in a tunnel?  GPS Location? A light sensor? A combination of both?
                        

Asked by JC5577 (697 rep)

Sep 30, 2012, 06:43 PM
Last activity: Sep 12, 2021, 02:53 PM

How does Google Maps Navigation know you are in a tunnel when it switches to night mode?

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