(3) aircraft refueling vehicles or vehicles and
combinations carrying milk, raw coal, flat-rolled steel
coils, steel slabs, [hot ingots, a hot box,] pulpwood and
wood chips, raw water or cryogenic liquid or sugar which
exceed the maximum weight specified in Subchapter C while
they are in the course of manufacture and under contract with
or under the direct control of the manufacturer, provided
that they do not exceed the maximum height, width or length
specified in Subchapter B unless they also qualify under
paragraph (1), subject to the provisions in subsection (a.2).
(a.2) Specifications.--
* * *
[(5) A combination of vehicles which is hauling a hot
ingot or a hot box may be permitted by the department and
local authorities to move upon highways within their
respective jurisdictions a distance not exceeding 25 miles if
the gross weight does not exceed 150,000 pounds and the
weight of any nonsteering axle does not exceed 21,000 pounds.
No permit may be issued for this type of movement upon an
interstate highway.]
* * *
(b) Definitions.--As used in this section, the following
words and phrases shall have the meanings given to them in this
subsection:
"Bulk milk." The term shall mean milk, as defined in section
1 of the act of July 2, 1935 (P.L.589, No.210), referred to as
the Milk Sanitation Law, which is not transported in packages.
"Condensed milk" and "evaporated milk." The term shall mean
manufactured dairy products as defined in section 1 of the act
of July 2, 1935 (P.L.589, No.210), referred to as the Milk
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