Horses can’t be ridden on it, because you can’t canter on tarmac.
Well - I'm no way a horsey type, never having ridden a horse (actually I tell a lie - I was once - as a teenager - very nervously - mounted on the back of a very obliging grey mare for a few minutes - and there's 8mm movie footage to testify to this foolhardiness)
- as I said, without a single equestrian skill, nonetheless I reckon I know a bit more about horses than the article's author does. After all, I meet horses - and their riders - on just about every weekend ride around these parts of Sussex. You can't help learning the ins and outs of horse sense, how to approach a horse without spooking it, what sort of approach puts a horse at ease, telling an old experienced horse from a young nervous one, etc. etc...
I could nominate a good half-a-dozen riding stables within a stone's throw (well, metaphorically) of my place, where this young lady would be well advised to enrol and assimilate a few riding skills, before she mouths off about being 'unable to canter'... There's a whole lot of riding manoeuvres you need to master, before you come anywhere near 'cantering'.
Moreover, if I were to find myself cycling on said path, I would naturally adapt my speed to that appropriate for the path's conditions - which might well, at busy times, mean slowing down to the speed of other users. Does one not have to do the same when driving one's car in heavy traffic (perhaps Her Ladyship does not...)?