Injury crashes involving drivers > 60 years of age
Pdoge60
Property damage only crashes involving drivers > 60
years of age
Ttllt60
Total crashes involving drivers < 60 years of age
Fatlt60
Fatal crashes involving drivers < 60 years of age
Injrlt60
Injury crashes involving drivers < 60 years of age
Pdolt60
Property damage only crashes involving drivers < 60
years of age
Explanatory variables
Rpcinc
County real per capita income: 1982-84 US $
Cpigas
Regional consumer price index for gasoline: 1982-84 = 100
Cpialc
Regional consumer price index for alcohol: 1982-84 = 100
Uerate
County unemployment rate
Vmtge60
County vehicle-miles traveled (vmt): drivers > 60 years old
Vmtlt60
County vmt: drivers < 60 years old
Totvmt
Total county vmt
Popden
Persons per square mile in the county
Pctge60
Share of the county population > 60 years old
Alclic
Number of retail alcohol licenses in the county
AB541
Dummy variable for an omnibus DUI prevention law (effective Jan. 1, 1982), which equals 0 for 1981 and 1 for 1982-98
APS
Dummy variable for an administrative per se license suspension law (effective July 1, 1990), which equals 0 for 1981-89 and 1 for 1990-98
Slmt_65
Dummy variable for 65 mph speed limits on rural Interstate highways (effective May 1987), which equals 0 for 1981-86 and 1 for 1987-98
Slmt_70
Dummy variable for 70 mph speed limits on portions of the state's Interstate highways (enacted in January 1997), which equals 0 for 1981-96 and 1 for 1997-98
