| traffic2 | R Documentation |
Wooldridge Source: P.S. McCarthy (1994), “Relaxed Speed Limits and Highway Safety: New Evidence from California,” Economics Letters 46, 173-179. Professor McCarthy kindly provided the data. Data loads lazily.
data('traffic2')
A data.frame with 108 observations on 48 variables:
year: 1981 to 1989
totacc: statewide total accidents
fatacc: statewide fatal accidents
injacc: statewide injury accidents
pdoacc: property damage only accidents
ntotacc: noninterstate total acc.
nfatacc: noninterstate fatal acc.
ninjacc: noninterstate injur acc.
npdoacc: noninterstate property acc.
rtotacc: tot. acc. on rural 65 mph roads
rfatacc: fat. acc. on rural 65 mph roads
rinjacc: inj. acc. on rural 65 mph roads
rpdoacc: prp. acc. on rural 65 mph roads
ushigh: acc. on U.S. highways
cntyrds: acc. on county roads
strtes: acc. on state routes
t: time trend
tsq: t^2
unem: state unemployment rate
spdlaw: =1 after 65 mph in effect
beltlaw: =1 after seatbelt law
wkends: # weekends in month
feb: =1 if month is Feb.
mar:
apr:
may:
jun:
jul:
aug:
sep:
oct:
nov:
dec:
ltotacc: log(totacc)
lfatacc: log(fatacc)
prcfat: 100*(fatacc/totacc)
prcrfat: 100*(rfatacc/rtotacc)
lrtotacc: log(rtotacc)
lrfatacc: log(rfatacc)
lntotacc: log(ntotacc)
lnfatacc: log(nfatacc)
prcnfat: 100*(nfatacc/ntotacc)
lushigh: log(ushigh)
lcntyrds: log(cntyrds)
lstrtes: log(strtes)
spdt: spdlaw*t
beltt: beltlaw*t
prcfat_1: prcfat[_n-1]
Many states have changed maximum speed limits and imposed seat belt laws over the past 25 years. Data similar to those in TRAFFIC2.RAW should be fairly easy to obtain for a particular state. One should combine this information with changes in a state’s blood alcohol limit and the passage of per se and open container laws.
Used in Text: pages 378-379, 409, 443, 674, 695-696
https://www.cengage.com/cgi-wadsworth/course_products_wp.pl?fid=M20b&product_isbn_issn=9781111531041
str(traffic2)