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Changes in surface materials need to be carefully considered, in my view. In certain spaces they work well as they subtly create the order thats required. However sometimes they look a mess and seem to promote needless clutter for some reason, like bollards etc.
One thing that I do think works well in most cases is things like drop kerbs, or a textured kerb stone at the beginning and end of the designated routes.
Thanks both. Mixed surfaces would be good way of creating contrast with the right level of light but looking at the latest landscape info there's a continuous paved pattern going through the whole site that may be difficult to influence. They don't want to put anything vertical in the area to keep it clear for events. Marker lights have been mentioned as a way of highlighting the most sensible route but they do little to warn pedestrians of cyclists and vice versa. Signage (which hasn't been mentioned so far) could work well to provide orientation points either side of the square if they are well lit at night.