Signs are generally placed to warn, to inform, or to remind
people of important information. Without signs, drivers may not
realize that there's a blind driveway around that curve, or even
that there's that dangerous 90 degree curve on the cliff's edge
right after you come over the hill. Signs are important in our
daily lives, helping keep us safe and ensuring the orderly
progression of society.
But there is a concept known as "too much of a good thing."
Signs multiply, become obstructive, unhelpful, and downright
irritating. It is often said that every rule exists because someone
did the opposite of it at some point. If new signs must be placed
every time someone forgets a tiny piece of information, we may be
doomed to an eternal purgatory of signage. Welcome to the Time
of the Signs.

Ah, the sidewalk, used by many in big cities, but so out of
fashion in San Antonio, land of the automobile. However, even those
traveling on foot deserve their fair share of signs, particularly
when the very sidewalk they depend on is not long for this world.
But progress comes to all corners of the world, and sidewalks which
once vanished into thin air are being improved and extended! Your
tax dollars at work!
So, nice new sidewalk, goes a lot further than it used to, want
to encourage people to use it. But man, it'd be an awful lot of
work to take down that sign indicating you can't go any further.
We'll just leave it up, I'm sure everyone can figure it out for
themselves that they can keep walking, right?
I wouldn't be surprised if at some point the city realizes that
this one really needs to go, but even after the construction was
completed (or at least completed for as far as you can see here)
the sign remains, and has had another sign added to its post. If
any finders get there and don't get the joke, or why I thought it
was an amusing Time of the Signs, give me a heads up. If the gag's
gone, the cache will follow.