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@GA2G
I've thought about this a lot, and for a long time. kerley is right. The ridges of rubber, are going to deform, giving unpredictable handling, and the pronounced curse of tramlining.
I wondered why would Halo design such a poor feature into a tyre. Well there are two or three reasons I can think of.
The ridges/twin-rails when new, make the tyre faster (on flat roads, not round corners), due to reduced road contact.
In slush, or mild winter snow, they do grip really well. Its the little pockets next to the ridges that do the work.
Useful as an early tyre wear indicator. But this is hardly beneficial to be honest.
In all, I think the pockets next to the rails are what make the tyre more of an all-season tyre. If it was truly designed for couriers, then light snow would have to be a factor in the end design result. A smooth tyre may be good in the wet, though buggered in greasy conditions, but it is also near useless in snow.