1020 LAWS OF MARYLAND [CH. 506

(2) Horns. Every such motor vehicle shall be equipped
with a suitable bell, horn or other signalling device producing
an abrupt sound sufficiently loud to serve as an adequate
warning of danger, but no person operating any motor vehicle
shall make or cause to be made any unnecessary noise with
such bell, horn or signalling device, or use the same except as
a warning of danger, and such signalling device shall not be
sounded while passing a horse or other animal in the open
country. Within the limits of cities, towns and villages, loud
sounding signalling devices shall not be used during the
period from one hour after sunset to one hour before sunrise,
unless absolutely necessary to avoid accidents. An adequate
signalling device shall in all cases be sounded on approach-
ing curves, tops of hills and intersecting highways in the
open country where the operator's view is obstructed.

(2-A) Mirrors. Every commercial motor vehicle not equip-
ped with pneumatic tires, and every commercial motor vehicle
so constructed or loaded that the operator is prevented from
having a free and unobstructed view of the highway imme-
diately to the rear and at the sides of the same, shall be equip-
ped with a mirror or reflector attached to and so located and
adjusted on such vehicle as to give the operator thereof a
clear reflected view of the highway to the rear of such vehicle.
It shall be the duty of the owner of such motor vehicle to equip
the same with a mirror or reflector as aforesaid and see that
the same is maintained on such vehicle, and of the operator
thereof at all times to see that such mirror or reflector is kept
in proper adjustment as aforesaid. The failure of either
to do as above required shall be a misdemeanor punishable by
a fine of not less than five dollars ($5.00) nor more than fifty
dollars ($50.00) for the first offense.

(3) Lights. Every vehicle, including motor vehicles and
horse drawn vehicles, operated or driven on the public high-
ways of the State, at any time when there is not sufficient
daylight to render clearly discernible a person, vehicle or other
substantial object on the highway at a distance of two hundred
(200) feet ahead, shall be provided with lighting facilities of
sufficient power and so adjusted and operated as to enable
the operator or driver to proceed with safety to himself and
other users of the highways under all conditions of light, road
and weather; provided, however, that the following classes