It would be a fair attribution to say that the behavior of the vehicle as viewed from another drivers perspective was none of these situations as the driver was to at least some extent still in control of the car. While I do not know the exact model of the Jeep I'm assuming that there is a mechanical emergency brake still present.
Stopping in the middle of traffic is probably very low on the metric of causes of accidents or death. Although I did not accumulate enough data to give a metric on how much risk the researchers incurred through this experiment it may be beneficial for the author to at least do some due diligence in acquiring data before labeling an industry (one the author is well known in for that matter) as having an inability to quantify risk and then immediately fail to quantify risk.
[1] Pretty ironic that the author fails in his own analysis while talking about 'proper "risk analysis"'.