This accident has all the haulmarks of an air suspended semi, hauling a high centre of gavity load, losing control and subsequently incurring a roll over in or immediately post a long sweeping bend. The tractor most likely had a trailing arm suspension and a single high gain LHS mounted ride height control valve.

When will Authorities realise standard air suspensions have inherent safety deficiencies.
Luckily these deficiencies can be readily and confidently allayed. Hope the driver is OK.