1992 CENSUS OF TRANSPORTATION
1992 TRUCK INVENTORY AND USE SURVEY 


SUMMARY OF FINDINGS FOR IOWA


TRUCK CHARACTERISTICS  

The estimated number of trucks that were within the scope of the TIUS
and registered in the State during 1992 was 930,600, a 37.0 percent
increase from 1987.  

The Federal Highway Administration (FHWA) estimate of the number of
private and commercial trucks registered in the State as of December 31,
1992, was 740,600.  This estimate is based on a calendar year summary
report from each State. It reflects differences in truck definitions
used by each State for vehicle registration from those used in the TIUS. 


SAMPLE DESIGN

A probability sample of 2,978 trucks was selected to represent the
universe of trucks registered in the State in 1992.  


RELIABILITY OF THE ESTIMATES  

For the State, approximately 93.7 percent of the questionnaires were
returned with some response.