These are heavy horses. Police horses, they look like Percherons. They are at least 16 hands, assuming the police riders are average height. Not controlling any crowds as far as I can see. Assuming they have borium shoe-nails for getting a grip on pavement but you never know. The martingales have no attachment between front legs to the cinch/girth so don’t know what good the martingales would do. Also the stirrups don’t seem to be the breakaway type. Also their boots/leg protectors don’t go over the knee.  So I guess this is just for the optics.