I went to the source.
I think you are okay.
Quote: There are certain exemptions from oversize/overweight permits. When traveling on
any road other than an interstate highway, certain vehicles are exempt from the permitting
requirements. They include:
1) A vehicle engaged in the construction of highways, when the movement of the vehicle
is confined to highways, roads, or sections that are under construction and not yet open
to the public. The only exception to this would be if the authority having jurisdiction
over the construction of a public highway gives notice that a permit is needed.
2) Machinery or equipment used in highway construction or maintenance by the Indiana
Department of Transportation, or by Indiana counties or municipalities.
[b:2ff34f65a2]3) Implements of agriculture when used during farming operations or when so constructed [/b:2ff34f65a2]
that the implements can be moved without material damage to highways.
4) The width or height of a farm vehicle loaded with a farm product. This includes a
truck hauling unprocessed tobacco leaf.
5) Fire-fighting apparatus owned or operated by a political subdivision or volunteer fire
company.
6) The movement of a disabled vehicle or combination of vehicles for a distance that
does not exceed fifty (50) highway miles by a registered recovery vehicle or by a
vehicle described in IC 9-18-13-5 is exempt from the dimension and weight limits
under this article.[/url]http://www.in.gov/dor/files/osowhandbook.pdf