Analysis of the Vehicle Inventory and Use Survey for Trucks ... - About

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trailer. Removal of these vehicles creates a data set referred to in this analysis as the “1992/1997 Total Fleet.” For most of this analysis, the 5-axles or more truck/tractor-trailer combinations were evaluated which are a subset of the “Total Fleet.” The “5-Axles or More Fleet” contains data for various types of truck/tractor-trailer combinations whose total number of axles is greater than or equal to 5 and are of primary interest from a truck size and weight perspective. In general, there are four types of truck/tractor-trailer combinations evaluated: (1) straight truck with trailer; (2) tractor truck with semitrailer; (3) tractor truck with two trailing units; and (4) tractor truck with three trailing units. 1.4 Cautionary Notes The values presented in the tables throughout this report are the direct result of the analysis of the VIUS databases. There has been limited judgement as to their appropriateness; that task is the responsibility of the reader. It should be noted that the VIUS is based on survey data which assumes that the respondents will devote some time and effort to giving accurate estimates and responses about their vehicle. The Bureau of the Census did do some quality checking of the data. State of Registration. The data presented in this report has been analyzed on the basis of the state of registration. In drawing inferences from the data, the potential for a registration-bias must be recognized. However, the correlation between state of registration and state of home base location is approximately 90% for the 1997 VIUS. Home base state is defined as the location where the vehicle is parked when not in use. If state level detail is of interest, the correlation should be examined for that state and the vehicles of interest. Population Estimates. In the analysis of the VIUS database, each record does not reflect one vehicle, but instead it represents a number of vehicles in the population. To make interpretations about the total truck population from this small sample of the population, a weighting factor was applied to each record. This weighting factor differs for vehicles registered in different states and for vehicles belonging to different vehicle type groups. The reason that the weighting factor is not a constant number across all records is due to the method of sampling the truck population which was conducted at the state level, not the national level. Readers must be cognizant of the fact that this weighting process can create odd results in selected situations—particularly when the sample size relating to a particular group in the population is small. This is particularly true when analyzing the VIUS at the state level where many states have small sample sizes. For example, our analysis of the 1997 VIUS database estimated that New York has 65 vehicles operating as tractor + triple trailer combinations. New York does not permit such combinations it is likely that these tractors are registered in New York but operate in another State. Alternatively, the 65 vehicle population estimate could have arisen from an incorrect answer on as little as 1 or 2 survey records—which were subsequently factored-up to create the population estimate. 2
Small Sample Size. In general, readers must be very cognizant of the potential for “small size problems” in parts of the analysis presented in this report. As the data set is sub-categorized from national statistics, to regional statistics, to state statistics—by configuration, by body type—and subsequently into individual statistical measures such as “empty weight” or “width,” the sample used to estimate the population value for a particular cell may become very small. In a number of sections throughout this report, the sample sizes and population estimates associated with particular parameters are presented. Readers must use judgement and caution in assessing the appropriateness of the results presented from small samples. 3
Page 1 and 2: Federal Highway Administration Offi
Page 3 and 4: The primary objectives of this repo
Page 5 and 6: # Survey and population estimates a
Page 7 and 8: # Tank truck, liquids or gas # Othe
Page 9 and 10: TABLE ES-1 1992 U.S. COMMERCIAL FRE
Page 11 and 12: Table of Contents 1.0 Introduction
Page 13 and 14: List of Tables Table 2.1-1 The 5 Ma
Page 15: 1.0 Introduction 1.1 Purpose and Sc
Page 19 and 20: Table 2.1-1 The 5 Major Vehicle Con
Page 21 and 22: Figure 2.2-1 Vehicle Group Descript
Page 23 and 24: 7) Doubles @ 6 + Axles 8) Triples (
Page 25 and 26: 3.0 Analysis of the Distribution of
Page 27 and 28: Table 3.2-1 1997 Total Truck Fleet
Page 29 and 30: 3.4 Size of the 5-Axles or More Fle
Page 31 and 32: Number of Vehicles 1,400,000 1,300,
Page 33 and 34: Table 3.4-2 1997 Truck Fleet (@ 5-a
Page 35 and 36: # California has the largest state
Page 37 and 38: Table 3.5-1 Truck Fleet (@ 5-axles
Page 39 and 40: % of Fleet 100 90 80 70 60 50 40 30
Page 41 and 42: # 8 vehicle groups (see Section 2.2
Page 43 and 44: Truck Fleet (5-axles or more) Numbe
Page 45 and 46: Other Grain Bodies Tank Truck, Liqu
Page 47 and 48: Number of Vehicles 1,400,000 1,200,
Page 49 and 50: - household moving and office furni
Page 51 and 52: # For all truck + trailer combinati
Page 53 and 54: 6.0 Analysis of the 5-Axles or More
Page 57 and 58: # For the 3-S2 group, - One-fifth o
Page 61 and 62: 7.0 Analysis of Weights, Dimensions
Page 63 and 64: 7.2 Observations on Specific Truck
Page 65 and 66: # (3 + 2) Basic Enclosed Van [pop =
Page 67 and 68:
- Annual VMT—mixed. # (3-S2) Insu
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- half (40-60%) operate mostly (80-
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# (3-S3) Tank Trucks for Liquids or
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Body Type Low Boy Platform Basic Pl
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Body Type Low Boy Platform Basic Pl
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There has been a substantial increa
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3-S2 Basic Enc. Van 3-S2 Refrigerat
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7.5.2 Changes in Truck Lengths by 1
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7.5.3 Changes in Truck Weights # ME
Page 87 and 88:
Page 89 and 90:
Table 7.5.3-2 Comparison of Mean "A
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Average Weight (lbs) 80,000 70,000
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Comparison of Mean Maximum Payload
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Comparison of Mean "Average" Payloa
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8.0 Analysis of Vehicle Miles of Tr
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CHANGES BETWEEN 1992 AND 1997 Figur
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Mean VMT 100,000 90,000 80,000 70,0
Page 103 and 104:
Page 105 and 106:
Appendix A Regional Distributions o
Page 107 and 108:
1997 Truck Fleet Traffic Region: No
Page 109 and 110:
1997 Truck Fleet Traffic Region: So
Page 111 and 112:
Appendix B Regional Distributions o
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Not to Scale Truck + Trailer @ 6 or
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Not to Scale $ $ Tridem Axle Tracto
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2-S1-2 STAA Tractor + Double Traile
Page 119 and 120:
Not to Scale $ $ $ $ $ $ Base Scale
Page 121 and 122:
1997 Truck Fleet (@ 5-axles or more
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Page 125 and 126:
Appendix C Detailed Body Type Analy
Page 127 and 128:
Appendix C 1997 Truck Fleet (@ 5-ax
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Page 131 and 132:
Page 133 and 134:
Page 135 and 136:
Page 137 and 138:
Page 139 and 140:
Appendix E Weights, Dimensions, and
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VEHICLE TYPE: 3-S2 BODY TYPE: LOW B
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VEHICLE TYPE: 3-S2 BODY TYPE: LIVES
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VEHICLE TYPE: 3-S2 BODY TYPE: INSUL
Page 147 and 148:
VEHICLE TYPE: 3-S2 BODY TYPE: BASIC
Page 149 and 150:
VEHICLE TYPE: 3-S2 BODY TYPE: AUTOM
Page 151 and 152:
VEHICLE TYPE: 3-S2 BODY TYPE: DUMP
Page 153 and 154:
VEHICLE TYPE: 3-S2 BODY TYPE:TANK T
Page 155 and 156:
VEHICLE TYPE: 3+2 BODY TYPE: BASIC
Page 157 and 158:
VEHICLE TYPE: 3+2 BODY TYPE: POLE L
Page 159 and 160:
VEHICLE TYPE: 3+2 BODY TYPE: DUMP T
Page 161 and 162:
VEHICLE TYPE: 3-S3 BODY TYPE: LOW B
Page 163 and 164:
VEHICLE TYPE: 3-S3 BODY TYPE: INSUL
Page 165 and 166:
VEHICLE TYPE: 3-S3 BODY TYPE: POLE
Page 167 and 168:
VEHICLE TYPE: 3-S3 BODY TYPE: DUMP
Page 169 and 170:
VEHICLE TYPE: 2-S1-2 BODY TYPE: BAS
Page 171 and 172:
VEHICLE TYPE: 2-S1-2 BODY TYPE: BAS
Page 173 and 174:
Appendix F Average Payload Weights
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VEHICLE TYPE: 3-S2 AVERAGE PAYLOAD
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VEHICLE TYPE: STAA (2-S1-2) AVERAGE
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VEHICLE TYPE: 3-S2 MAXIMUM PAYLOAD
Page 181 and 182:
VEHICLE TYPE: STAA (2-S1-2) MAXIMUM
Page 183 and 184:
Regional Comparison of Mean Tare (E
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Regional Comparison of Mean Average
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Regional Comparison of Percent of T
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Regional Comparison of Percent of T
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Regional Comparison of the Mean Ann
Page 193 and 194:
Regional Comparison of the Percent
Page 195 and 196:
Appendix H Data Analysis Methodolog
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Configuration AXLRE Code 1997 4-S1
Page 199 and 200:
Vehicle Body Type VIUS Variables of
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Major Body Type Groups and their As
Page 203 and 204:
Since the analysis was focused on t
Page 205 and 206:
Industrial "waste" water Hazardous
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Simple Statistics In this analysis,
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PRNPRO 164-165 WANNMIL 166-178 VG 1
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Proc GLM data=dataset name; Class V
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RUN; H - 19
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U.S. DEPARTMENT OF COMMERCE BUREAU
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ITEM 5 Which best describes this ve
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ITEM 11 What type of cab does this
Page 221 and 222:
ITEM 18 What percent of 1997 mileag
Page 223 and 224:
. ITEM 27 Which of the following be
Page 225:
ITEM 29 a. At any time during 1997
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