Speed limits are often arbitrary and based on some sort of government regulation on the area (a state speed limit for example) or just decreased where there are narrower or winding roads.

The driver seems to be unaware of the negative effect she is having on the roads, creating a hazardous speed differential and upsetting other drivers.

I feel as though this is an inappropriate and dangerous place for the author to take her activism, putting others' lives at risk.

There is a reason why places such as the autobahn exist and have statistically lower accident rates when compared to standard roadways, even when there is no imposed speed limit. If someone like the author were to drive purposely slower than the traffic, the risk of accident increases greatly.