Serious traffic crashes are more likely to occur on Portland-area arterial streets than on highways. That’s one conclusion of a two-year study of crash data released by the Metro regional government. The "State of Safety" report found nearly 60 percent of serious injury crashes on roads like 82nd Avenue, or Tualatin Valley Highway. Metro Councilor Carlotta Collette chairs a regional transportation committee. She says the study suggests investing in road safety priorities that communities already want.