What does 我们已经帮您踩过了 mean in this peculiarly translated escalator sticker? I have this funny image which I believe says:


  这块位置
  我们已经帮您踩过了！


I took this photo in Tianjin, nearby an escalator.  Google Translate says it means:


  This location.  We've helped you step over!


However, the second sentence is unclear to me.

Question: What does 我们已经帮您踩过了 mean in this peculiarly translated escalator sticker?

I don't understand what 已经 and 踩过 implies here.  I know 已经 = "already" and 踩 = "stamp" and 过 = "pass", but this doesn't help much.
Please allow me to give you some background about this sticker.
On July 26th, 2015, one piece of plate, where the sticker is sitting, on an escalator turned over leaving a young women dead in Hubei China. This accident caused public in China worried about the safety of escalators, stepping onto a plate of an escalator may not safe. 

Shortly after that, these stickers came out, stating that "We had already stepped onto this area", which indicate to the public, the escalator is safe.

Similar pictures can be found here: http://www.xdwy2001.com/a/kantianxia/2015/1229/5062.html