Table 1 Definitions of Variables

Table 1
Definitions of Variables

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Dependent variables  
Ttlge60 Total crashes involving drivers > 60 years of age
Fatge60 Fatal crashes involving drivers > 60 years of age
Injrge60 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
Pc_dui Per capita DUI arrests in the county
Pcmcyc Per capita motorcycle registrations in the county