"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,,,,,,,,,,,,,,