Bureau of Transportation Statistics (BTS)
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Table 5-2: Michigan and U.S. Trailer and Semi-Trailer Registrations: 20001

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Type Michigan United States
Total 1,141,906 21,541,490
Private and commercial 1,137,298 21,283,681
Commercial trailers2 118,987 4,685,606
Light farm trailers, car trailers, etc.3 874,409 14,113,392
House trailers 143,902 2,484,683
Publicly owned 4,608 257,809
Federal government 87 4,277
State, county, municipal government 4,521 253,532

1 The completeness of data on trailer registrations varies greatly among states. Data are reported to the extent available and, in some cases, are supplemented by estimates of the Federal Highway Administration.

2 This row includes all commercial type vehicles and semi-trailers that are in private or for-hire use.

3 Several states do not require the registration of light farm or automobile trailers.

NOTE: Mobile homes and house trailers are shown for states that require registration and are able to segregate them from other trailers. In states where this classification is not available, house trailers are included with light car trailers.

SOURCE: U.S. Department of Transportation, Federal Highway Administration, Highway Statistics 2000, Washington, DC: 2001, table MV-11.