[Charles Henrickson]

Why is there a dark line running through the crowd??

That's the break where I-70 runs, separating the two big patches of land.

[Joiseydude]

That's the break where I-70 runs, separating the two big patches of land.

True, but you're talking about 10 lanes of traffic, plus two shoulders which combine to be 150 feet.

Yet, in the photo at the head of this article, that break looks like only 2 lanes of traffic.

[jellybean]

Why is there a dark line running through the crowd??

That's the break where I-70 runs, separating the two big patches of land.

I think it's a shadow from the Arch. Here's pic of the area.