Signs of the times

On a walk with Sandra and Marley, we met up with a sign that had us perplexed. But, just like that, the words of Woody Guthrie gave us strength to soldier on. 

As I was walkin'
I saw a sign there
And that sign said no trespassin'

But on the other side
It didn't say nothin!
Now that side was made for you and me!