Solomon curve

[1] Subsequent research suggests significant biases in the Solomon study, which may cast doubt on its findings.

[2] In 1964, Solomon researched the relationship between average speed and the collision rates of automobiles and plotted the results.

[3] While others have attempted to quantify the relationship between average speed and collision rates, Solomon's work was both "the earliest and best known".

[13] Notwithstanding the many studies over the years, in testimony before the Ohio Senate Highways and Transportation Committee on June 10, 2003, Julie Cirillo, Former Assistant Administrator and Chief Safety Officer for the Federal Motor Carrier Safety Administration (FMCSA), testified that "up to the present time there has been no evidence to alter Solomon’s original finding that variance from the mean operating speed is a major contributor to accidents".

[14] In July 2001, Kloeden CN, Ponte G and McLean AJ of the Road Accident Research Unit, Adelaide University quantified the relationship, "... between free travelling speed and the risk of involvement in a casualty crash in 80 km/h or greater speed limit zones in rural South Australia" using a case control study design.