1992 CENSUS OF TRANSPORTATION
TRUCK INVENTORY AND USE SURVEY


=>INTRODUCTION

The Truck Inventory and Use Survey (TIUS) provides data on the physical
and operational characteristics of the Nation's truck population. It is
based on a probability sample of private and commercial trucks
registered (or licensed) in each State during 1992. A sample of over
150,000 trucks were surveyed to measure the universe of over 60 million
trucks. 


=>  USES OF THE TRUCK INVENTORY AND USE SURVEY  
  
TIUS information is of considerable value to Federal, State, and local
transportation agencies in planning highway cost allocations, road
improvements, truck size and weight issues, user fees of commercial and
private vehicles, energy consumption, and other aspects of improving
transportation services for shippers and carriers.  The Federal
Government also uses these data as an important framework for the
national investment and personal consumption expenditures component of
the Gross Domestic Product (GDP), input-output tables, economic
development evaluation, maintenance of vital statistics for prediction
of future economic and transportation trends, logistical requirements,
and regulatory impact analysis.

Industry, business, academia, and the general public need these data to
assess the truck population's involvement with intermodal use, conduct
market studies and evaluate market strategies, assess the utility and
cost of certain types of equipment, calculate the longevity of products,
determine fuel demands and needs for fuel efficiency, and assess the
effects of deregulation on the restructuring of the transportation
industries. TIUS data are regularly used to link to and more accurately
utilize other data sets representing limited segments of the truck
universe.  


=>  UNPUBLISHED DATA  

Mileage estimates will not be shown separately in individual State
reports for 1992 as they were in past TIUS State reports. State mileage
estimates do not represent mileage activity within the State. Mileage
estimates will be shown in the U.S. Summary Report for the Nation's
truck population. Other physical and operational characteristics
estimates not shown separately in this report are produced as a by
product of the published statistics. These additional data have not been
published because of their high sampling variability, poor response
quality, or other factors that resulted in their failure to meet Census
Bureau standards for publication.  

The Bureau of the Census, upon written request, will release such
figures for individual use. It should be noted that some unpublished
figures can be derived from this report by subtracting published data
from their respective totals. However, such figures would be subject to
the high sampling variability described previously. These unpublished
estimates are for your internal use only.  


=>  COMPARABILITY WITH PREVIOUS SURVEYS  

Although the basic purpose and scope of the previous Truck Inventory and
Use Surveys were essentially the same as this one, some new items were
introduced in 1992 as well as some changes that may affect specific
items in this report. (See Explanation of Terms.)