k^2,
Which finding to you believe deserves skepticism and in your opinion why?
Although rather dated, I would think the data of today would compare well. It would not be exactly the same; but, the representations would be similar.
I'm unaware of any other motor study before or since that is early as comprehensive as the Hurt Report. Most of its data relates to rider behavior and cage driver behavior than to the actual performance of the bike or cage. Therefor, I believe little has changed regarding these human factors and the data still helpful, even though not exact.
Well, how about this for a starter.
According to the NHTSB, the number of fatalities per 10,000,000 vehicle miles traveled has declined from 4.9 in 1980 to 2.6 in 2000 and fatalities per 10,000 registrations declined from 8.7 in 1980 to 6.3 in 200 (actually up from a low of 5.3 in 96-97). Thus the number of fatalities has steadily declined, leading to several possible conclusions; better bike (with better brakes , steering and tires), more and better rider training, more widespread use of safety gear
or, possibly better safety gear. Now I don't know how these factors work in as I haven't collected or processed the updated data, but they do call into question the findings of any report, the Hurt included, which is based on old and outdated data.
Table 1. U.S. Motorcycle Registrations and Travel, 1975-2000
Year Registrations - US Travel - US Fatalities Fatalities per Fatalities per
(million miles) 10,000 10M VMT
Registered
1975 4,964,070 5,629 3,103 6.3 5.5
1976 4,933,332 6,003 3,233 6.6 5.4
1977 4,933,256 6,349 4,008 8.1 6.3
1978 4,867,855 7,158 4,451 9.1 6.2
1979 5,422,132 8,637 4,713 8.7 5.5
1980 5,693,940 10,214 4,961 8.7 4.9
1981 5,831,132 10,690 4,746 8.1 4.4
1982 5,753,858 9,910 4,270 7.4 4.3
1983 5,585,112 8,760 4,104 7.3 4.7
1984 5,479,822 8,784 4,431 8.1 5.0
1985 5,444,404 9,086 4,417 8.1 4.9
1986 5,198,993 9,397 4,309 8.3 4.6
1987 4,885,772 9,506 3,834 7.8 4.0
1988 4,584,284 10,024 3,492 7.6 3.5
1989 4,420,420 10,371 3,036 6.9 2.9
1990 4,259,462 9,557 3,129 7.3 3.3
1991 4,177,365 9,178 2,703 6.5 2.9
1992 4,065,118 9,557 2,291 5.6 2.4
1993 3,977,856 9,906 2,336 5.9 2.4
1994 3,756,555 10,240 2,190 5.8 2.1
1995 3,767,029 9,797 2,144 5.7 2.2
1996 3,871,599 9,920 2,046 5.3 2.1
1997 3,826,373 10,076 2,028 5.3 2.0
1998 3,879,450 10,260 2,186 5.6 2.1
1999 4,152,433 10,584 2,374 5.7 2.2
2000 4,346,068 10,479 2,747 6.3 2.6
Source: FHWA, FARS
Please understand, I have great respect for the Hurt Report, it was comprehensive and groundbreaking in its day. But time marches on and it should be updated. Basing conclusions on data which is decades is unsound in any pursuit.
NOTE - I spent nearly an hour formatting this chart for this post, however, teh forum software isn't holding the formatting. The last two columns are Fatalities / 10,000 registrations and Fatalities / 10MM Vehicle Miles Traveled)