The basic principles outlined above still hold good for horse transport by trailer or lorry today, and almost all horses are transported in this fashion, the horse generally wearing a standard headcollar which has a leadrope clipped underneath, which is then tied to a ring mounted to a horizontal beam. There is enough room given to allow the horse to move its head in order to access a haynet (snacking in-transit is very important as it gives the horse something to do rather than be stressed). Divider partitions can be mounted longitudinally or transversely, but must be close to the horse's body; there is some wiggle room allowed for on either side, but no more than that.
Air transport is slightly different in that each horse stands in its own individual open crate, which is then lifted onto or out of the fuselage.