Because of the area, they have to keep changing direction so they keep both units like this until they get to the open road and then change them to the normal configuration
@boblordylordyhowie Truck are only called by the outer wheel numbers insides don't count as they're paired up with an outer, these Tractor Units are twin steer 8 wheelers. 3.48 confirms 2nd axle in from front is a steer as well.
Nice to see that the UK actually does export things (most Brits buy hideous, ugly Korean Kia. cars and Chinese-made goods, then complain about the state of the economy etc)