Bicyclists push a button before entering the tunnel to turn the flashing lights on to let cars know they should drive carefully for bikers in the tunnel. Europeans really missing out on the thrill of American biking. This is somewhere along the Central California coast during my socal to norcal PCH bike trip.

玉木さい（ウィンザー）Imagining Heaven on Earth | पुरुष tm.org 

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And mind you this is a highway so cars are going pretty fast through there.

bro that would make me shit my pants

I once had to walk in a small, non busy tunnel in Norway and it was soooooooo creepy