1578 LAWS OF MARYLAND. [CH. 874

used exclusively for propelling agricultural or farming
implements not designed for hauling purposes on account
of its driving wheels being equipped with standard cleats.

(2) (Speed of Solid Tire Motor Vehicles, and Size,
Weight, Construction and Equipment of Motor Vehicles. )
The maximum rate of speed for motor vehicles, equipped
wholly or in part with solid tires, weighing six tons or less,
shall be twenty-five miles per hour. The maximum rate
of speed for motor vehicles, equipped wholly or in part
with solid tires, weighing in excess of six tons, shall be
twenty miles per hour. The weight of such motor vehicles
shall be computed by adding the weight of the vehicle and
the weight of its load. Whenever a trailer on solid tires
is attached to such vehicle, the weight thereof shall be
computed by adding the combined weights of such vehicle
and such trailer and the combined weights of the loads
thereon; provided, however, that when such trailer is
equipped with adequate brakes, the weight shall be com-
puted by adding the weight of the vehicle and its load, or
the weight of such trailer and its load, whichever
is the heavier; and provided further that not more than
one such trailer shall be attached to a motor vehicle on
solid tires while operating along any highway of this
State at a greater rate of speed than ten miles per hour.
The maximum rate of speed of all traction or other iron
tired engines, and motor vehicles or trailers equipped
wholly or in part with iron tires shall be six miles an hour.
No motor vehicle in excess of ninety-six inches in width,
including the load thereof, except traction engines, shall
be operated on any such highway in this State, and no
traction engine in excess of one hundred inches in width
shall be operated on any such highway, nor shall any
motor vehicle equipped with solid tires be so operated of
which the total weight of vehicle and load per inch in
width of each tire as such tires are rated by the tire manu-
facturers shall exceed six hundred and fifty pounds, with-
out the special permission of the State Roads Commission
in the case of a road under its jurisdiction, or the permis-
sion of the city authorities in the case of a city street, or
the permission of the county authorities in the case of a
county highway, nor shall any such vehicle be operated
at any time on any such tires when the rubber thereon is
less than one inch in thickness, nor where a uniform cross-
section of the tire is not maintained, and no such motor
vehicle, equipped with four wheels, of which the weight of
the vehicle and the load combined exceeds twenty-five thou-
sand (25, 000) pounds shall be operated on any highway
of this State, and no such motor vehicle, equipped with six