Hi Dan,

I tagged this as metal, when I jogged through it back in July, because there isn't a tag for "metal substrate with some kind of non-slip dressing applied to it." There are countless footbridges and steps like this so perhaps we should seek guidance as to how to tag, or even propose a new value. If it's literally the *surface* as seen that needs the tag then asphalt is probably the closest match.

Regards,
_Paul_