LICENSES. 343

approach of any ambulance or police or fire department vehicle giving
audible signal by bell, siren or exhaust whistle, the operator of every other
vehicle shall immediately drive the same to a position as near as possible
and parallel to the right hand edge or curb of the highway, clear of any
intersection of highways, and shall stop and remain in such position
unless otherwise directed by a police or traffic officer until the ambulance,
police or fire department vehicle shall have passed. It shall be unlawful
for the operator of any vehicle other than one on official business to follow
any fire apparatus traveling in response to a fire alarm closer than six
hundred feet or to drive into or park such vehicle within six hundred feet
to the place where fire apparatus has stopped in answer to a fire alarm.

The State Roads Commission is hereby authorized and directed to desig-
nate main traveled or through highways by erecting at the entrances thereto
from intersecting highways signs notifying drivers of vehicles to come to
a full stop before entering or crossing such designated highway, and when-
ever any such signs have been so erected, it shall be unlawful for the
operator of any vehicle to fail to stop in obedience thereto, except when
traffic at such marked intersection is controlled by traffic signals or officers.
All such signs shall be illuminated at night or so placed as to be illumi-
nated by the headlights of an approaching vehicle or by street lights. The
operator of a vehicle entering a highway so designated shall yield the right
of way to all vehicles approaching on such highway, provided that at the
intersection of two highways so designated, all vehicles shall have the
right of way over other vehicles approaching on the intersecting highway
from the left and shall give right of way to those approaching from the
right; provided, however, that within the limits of Baltimore City, the
designation and marking of such main traveled or through highways shall
be made by the Police Commissioner of Baltimore City.

No ordinance, rule or regulation of any municipality or county shall
change or abrogate in any way these provisions of the General Law with
reference to right of way, even though any such ordinance be an attempted
exercise of the Police Power delegated to such municipality or county.

The operator of a vehicle about to stop or trim to the left shall give a
signal to those behind by extending or raising the hand, or by a suitable
mechanical device.

No vehicle of any kind or description shall be parked with any of the
wheels thereof on the paved or improved part of any public highway of
this State, outside of the corporate limits of any municipality, at or near
the top of any hill, nor near, on, or within any curve, where the view to the
front or rear for the entire width of the improved part of said highway is
obstructed within a distance of two hundred feet in either of said direc-
tions nor shall any vehicle of any kind be parked on the improved or paved
portion of any State or State aided road, outside of the corporate limits
of any municipality, unless there is a clearance of at least twelve feet of
improved or paved highway on the left side of said vehicle for the free and
unobstructed passage of other vehicles on said road; provided there is an
adequate shoulder or space on the right side of sand road for vehicles to