Honking in the tunnel

Okay, I have now lived in Beaverton for about 3 months now and have wondered why in the hell do so many people honk their horns in the Vista Ridge Tunnel? You know the one people of PDX, the tunnel on 26, yes that one. We had a tunnel in Tacoma on the waterfront that was down right scary; you had to honk your horn so you would avoid a head on collision. But your tunnel is so nice and wide. So what is it? Hmmm, I saw a bumper sticker that said; “Keep Portland Weird” Perhaps that answers my question.