For those who are not familiar with the technical sounding term for something that you see in normal everyday life in the city, tactile pavings, also known as tactile ground surface indicators (TGSI) are:

a system of textured ground surface indicator found on footpaths, stairs and train station platforms to assist pedestrians who are visually impaired


My experience with some of these tactile pavings is that if they are made from certain types of water resistance material (e.g. metal or plastic-like material) then they often become somewhat of a slip hazard when there is a lot of water on the surface (such as when it is raining).

It would seem rather curious that something created to assist pedestrians who are visually impaired would be a potential slip hazard for those who are not visually impaired. This is despite the fact that there are various building or design standards that require the testing of TGSI. However, as can be seen in some discussions online, this is not always the case due to a number of factors.

Is this something that is taken into consideration in the design and development of tactile ground surface indicators? How come people who are visually impaired don't seem to have a problem with this (or maybe they do but are less affected by it)?

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    From reading one of the personal accounts cited in that Wikipedia article, it seems these can be physical impediments to people with other mobility concerns as well, for example, people in wheelchairs, or anyone using any other kinds of smaller wheels for mobility (motorized scooter, stroller, skateboard...). I'm not specifically enlightened on this issue, but just thought it was interesting that these can both help and be hindrances to many people. – maxathousand Oct 15 '18 at 13:44
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    The ones in my city are made of a porous type concrete, quite grippy. – DarrylGodden Oct 15 '18 at 14:17
  • @DarrylGodden which city might that be? – Michael Lai Oct 15 '18 at 14:48
  • Sorry, Birmingham. – DarrylGodden Oct 15 '18 at 14:50

It's the story which affects all kinds of defective design:

  • No one thought to consider 'wider issues' in the design ( eg the design was focussed on the problems they thought they had, but never considered other issues which weren't 'in the spec' )

  • No one tested it thoughly ( and that would need to have been a long term test to see how it stood up to weathering )

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  • There are standards that must be adhered to with these types of things though... and I must admit that if TGSIs need to be water resistant then it would be difficult to make it non-slip as well. Is it just a very difficult material to create? – Michael Lai Oct 15 '18 at 23:50

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