It is motion immediately before impact, such as: "going straight", "turning left", "passing", "merging", etc.
I'll put something together in a day or two. For now, here are two from recent work:
Annual Bay Area crashes increased by one-third from the recession low in 2010 to 2015 (this includes all police-reported motorcycle crashes from non-injury to fatal). Which age groups were most affected?
Crash lethality, the likelihood of a motorcycle crash killing the rider, differs by age group, as one might expect. But in California, with all of its geographic and demographic variation, it also differs by region:
This graph shows the percentage of riders (passengers excluded) who died in police-reported crashes. Regions are:
- Sacramento Valley: counties on the I-5 corridor from Sacramento to Redding
- Bay Area: 9 counties on the Bay + Santa Cruz
- Central Coast: Ventura to Monterey plus San Benito
- San Joaquin Valley: I-5 corridor from the Grapevine to Stockton
- El Lay: Los Angeles and Orange Counties
- Inland Empire: Riverside and San Bernardino Counties
- Sandy Eggo: San Diego and Imperial Counties