The calculation of motor-vehicle fatalities per exposure hour per year is based on the number of registered cars, an assumed IVi ... on the number of passenger- hours per year and the assumption that the average person flies 20 hours, or 4000 miles, annually. ... hour is based on information obtained from the National Ski Patrol for the 1967-68 southern California ski season: 1 fatality, 17 days of skiing.
|Title||:||Readings in Environmental Impact|
|Author||:||Peter E. Black, Lee Pierce Herrington|
|Publisher||:||Ardent Media - 1974|