Originally Posted by
RobertHurst
The Cross statistics may be "robust" for 1975, or whenever, but they should not be assumed to apply to today's situation, because the demographics of the cycling population have changed so drastically since then. The cycling population is completely, utterly different in its make-up, and will exhibit completely different characteristics.
Forester doesn't mention that Cross-Fisher is most useful for showing the vast differences in types of wrecks most often experienced by kids, versus those experienced by adults.
No he doesn't... but many of us are aware of that anomaly.
With regard to the dating of the data, there are also new devices called cell phones which may be causing a distraction factor that may not have occurred at the same frequency back in 1975. While cell phones and other new distractions won't change the specific types of collisions that were cataloged, such distractions may have changed which types of collisions occur how often and the severity of the collision.