1270                             Laws of Maryland                      [Ch. 397

(2) "Abandoned motor vehicle" means a motor vehicle that is in-
operable and is left unattended on public property for more than
forty-eight hours, or a motor vehicle that has remained illegally on
public property for a period of more than forty-eight hours, or a
motor vehicle that has remained on private property without the
consent of the owner or person in control of the property for more
than forty-eight hours.

12-402 (c).

1.  No motor vehicle shall be operated, nor shall the owner or lessee
of a motor vehicle permit it to be operated, upon the public high-
ways of the State unless the engine power and exhaust mechanism
shall be equipped, adjusted, and operated to prevent

(i) The discharge of clearly visible smoke (comparable to smoke
equal to or darker in shade than that designated as No. 1 of the
Ringelmann Chart as published by the U. S. Bureau of Mines) in
the exhaust emissions within the proximity of the exhaust outlet for
more than ten (10) consecutive seconds;

2.    Smoke is defined as small gasborne and airborne particles,
exclusive of water vapor, from a process of combustion in sufficient
numbers to be observable.

3.    No motor vehicle engine shall be allowed to operate for more
than five (5) consecutive minutes when it is not in motion except
as follows:

(i) When a vehicle is forced to remain motionless because of
traffic conditions or mechanical difficulties over which the operator
has no control;

(ii) When it is necessary to operate heating and cooling or aux-
iliary equipment installed on the vehicle;

(iii) To bring the vehicle to the manufacturer's recommended
operating temperature;

(iv) When it is necessary to accomplish the intended use of the
vehicle;

4.    For a period [on] of one (1) year from July 1, 1971, this
subsection shall be enforced by issuance of a warning. One (1) year
from July 1, 1971, it shall be enforced in the same manner as other
violations of this section.

5.    The provisions of this subsection do not apply to antique motor
vehicles registered under Section 3-825 of this article.

Sec. 2. And be it further enacted, That this Act shall take effect
July 1, 1972.

Approved May 26, 1972.

CHAPTER 397
(Senate Bill 241)

AN ACT to repeal and re-enact, with amendments, Sections 140, 257
(a), 277 (j), 281 (a), 281 (h), 282 (c), 287 (d), and 700A (b-1)
of Article 27 of the Annotated Code of Maryland (1971 Replace-