I think they aren't considering zebras because of the 'road block' effect with large volumes of pedestrians you often see in the park (like at the recent zoo events on Friday evening). They would be a good thing for cycling at certain times (before the park opens), but probably dangerous at other times (people will 'jump' zebras too) but I understand the plans are quite advanced for speed tables at the junctions, possibly with a cobbled surface on top.
I think they aren't considering zebras because of the 'road block' effect with large volumes of pedestrians you often see in the park (like at the recent zoo events on Friday evening). They would be a good thing for cycling at certain times (before the park opens), but probably dangerous at other times (people will 'jump' zebras too) but I understand the plans are quite advanced for speed tables at the junctions, possibly with a cobbled surface on top.