Kc Jackson:  You are spot on with all of the issues you raised.  Having spent 54 years in the aviation industry there is a definite parallel between aviation accidents and the tanker truck accidents but NTSB simply does not have the assets to investigate them all.  In North Dakota, that also has large oil reserves under development, the accidents/lack of experienced drivers/poor road conditions/greed/speed and so forth all contributed to the wreckage and carnage there as well.  Certainly these issues can be addressed easily and fixes developed but that costs money, both for the oil companies and the drivers so likely very little will be done. No, the oil companies do not own the rigs; the rigs are owner/operator units which releases the oil companies from responsibility for the operation of the rigs.  A sidebar:  anyone who does not believe the oil companies are the richest enterprises on the planet should get hold of a financial statement from ANY ONE of them.