The Solomon Curve shows you're more likely to crash driving below the traffic flow than slightly above it. Slower speeds disrupt the rhythm and increase conflict points.

 
The Solomon curve is a graphical representation of the collision rate of automobiles as a function of their speed compared to the average vehicle speed on the same road. The curve was based on research conducted by David Solomon in the late 1950s and published in 1964

In a landmark study of speed and crashes involving 10,000 drivers on 600 miles (970 kilometers) of rural highways, Solomon (1964) found a relationship between vehicle speed and crash incidence that is illustrated by a U–shaped curve. Crash rates were lowest for travel speeds near the mean speed of traffic, and increased with greater deviations above and below the mean.

https://en.wikipedia.org/wiki/Solomon_curve

https://www.cazbike.org/brush-up-on-the-solomon-curve/

https://www.fhwa.dot.gov/publications/research/safety/98154/speed.cfm

I'd never heard of the Solomon Curve until just now, so I'm posting it right now... and I've never heard of   “Stannard’s Law” which states “drivers tend to explain their traffic accidents by reporting circumstances of lowest culpability compatible with credibility (Aronoff, 1971)”