Why do Japanese people speed up in tunnels?

Hello, I was driving on the expressways in the Kansai area and was wondering why drivers would noticeably speed up when they enter tunnels, and return to a lower average speed when they leave.

I’m curious because where I’m from, people mostly slow down because of the darkness/confined space.

Is there a culturally specific reason why? Or is this a dumb question. Thank you so much in advance!

by Minimum_Performer_86

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