“Accessible Message Only”

And pedestrian UX confusion

This is a photo of a device on a telephone pole. It reads "Accessible Message Only" and has a button on it.

Maybe it’s just me, but I find that the meaning of the phrase “ᴀᴄᴄᴇssɪʙʟᴇ ᴍᴇssᴀɢᴇ ᴏɴʟʏ” in this context is, for lack of a better word, inaccessible. Well, not fully inaccessible. I was able to access some information by looking it up. What it means is that you don’t need to press the button to safely cross. Instead, the button is simply to provide a sonic alert — which makes me wonder why there’s a button in the first place. And if there is to be a button, why have it point across the street like other crossing signals, instead of displaying a symbol that means, you know, “press this to hear something”?

This device must be fairly new. The reason I say so is that at the moment a Google search (with quotation marks) for the phrase “ᴀᴄᴄᴇssɪʙʟᴇ ᴍᴇssᴀɢᴇ ᴏɴʟʏ” yields a mere 10 results — 11 as of when I post this to my disquiet.com website — and only 6 of which even apply. (The others include one that relates to wireless routers, another two about the programming language C++, and one to a photo on Reddit that happens to show one of these buttons but is actually about something else entirely — something quite funny — which means that Google’s algorithmic robots read and indexed the text shown within the photo).

Of those meager search results, one that lends some useful context for the phrase is a master-plan document from the Montgomery County Planning Department in Maryland, which is citing San Francisco as an example of the device’s utility. It reads:

Precedent(s): In San Francisco, APS at locations where there is always a pedestrian signal read “Accessible Message Only” so people know they do not need to press to safely cross.

APS stands for “Accessible Pedestrian Signals.” I learned that and a lot of other things during this deep dive — which is what should happen if you look, and listen, closely — none of which convinced me this crossing signal is well-designed. Sounds are an essential part of public safety. Sounds are often all the more effective in coordination with other senses (here: touch and sight). This signal, however, is not an example of effective sensory coordination.

And speaking of looking closely: if you do so, you may notice some Braille on the sign.

This is a close-up of the sign showed at the top of the page. The close-up displays the Braille that wasn't entirely self-evident in the larger photo.

I couldn’t sort out the meaning of the Braille with any of the character charts I found online, so I asked around (which is to say I posted a request on Twitter, Mastodon, and Facebook), and the super-helpful @buttcliff on Twitter pitched in, big time. I learned that this isn’t just Braille, but “contracted Grade 2 Braille,” which is like Braille shorthand. (Using contracted Grade 2 Braille can, for example, make Braille books a lot thinner.) Those first two visible dots confused me because I didn’t even see them on any Braille charts online, and now I understand that they mean that everything following them is a word. In this case, the Braille reads: “C A L I,” then a contraction for “FOR,” then “N,” and then something obscured by apparent damage to the sign, presumably “I A” — which makes sense, because I was standing at an intersection on California Street here in San Francisco when I took the photo.

Braille isn’t inherently a part of sound studies. However, much as sound studies can do a lot to inform UX design, so too can the closely related lived experiences of the hearing impaired. It’s a problem if a safety sign is confusing. It’s a problem if a button intended to make a sound looks like a standard button required to provide physical access to a public space. It’s a problem if a sign (seemingly a new one, at that) designed to assist the visually impaired is so susceptible to damage that it can obscure one of the ways it is intended to communicate to that constituency.

I’m guessing that someone dependent on Braille could make sense of this without the “I A,” but it says something that I started sorting out what this sign meant because it’s confusing, and it turned out it had an additional level of illegibility I wasn’t even initially aware of. Now that’s a sign.

One thought on ““Accessible Message Only”

  1. “Accessible Message Only” is one of those things that I notice every day when I’m out walking and then forget to research once I get home. Today, I remembered and found your post. Thank you!

    I agree with your points on design. While I did ultimately conclude that the button didn’t need to be pressed to cross and likely only existed to trigger an audible alert, I was initially confused since it looks exactly like a button that needs to be pressed to get a walk signal.

    As to “why there’s a button in the first place”, I assume it’s to limit intersection noise. Crossings that chirp or buzz throughout the day might annoy local businesses and residents, so perhaps the button limits the noise to times when it’s actually useful?

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