Md. Code, Local Government § 12–527

(a) This section applies only to:

(1) Allegany County;

(2) Baltimore County;

(3) Calvert County;

(4) Carroll County;

(5) Cecil County;

(6) Frederick County;

(7) Garrett County;

(8) Harford County;

(9) Howard County;

(10) Montgomery County;

(11) Prince George’s County;

(12) St. Mary’s County; and

(13) Washington County.

(b) (1) Except as provided in paragraph (2) of this subsection, the

governing body of a county may adopt and enforce rules and regulations relating to

the maximum size and weight of motor vehicles that may be operated on county

roads.

(2) The governing body of a county may not set the maximum weight

under paragraph (1) of this subsection at a weight greater than the maximum allowed

by the public general laws of the State.

(3) Rules and regulations adopted under this subsection shall:

(i) have a reasonable relationship to the construction, use,

and character of the road; and

(ii) be designed to assure the continued safety and good

condition of the road.

(c) A person who violates a rule or regulation adopted under this section is

guilty of a misdemeanor and on conviction is subject to imprisonment not exceeding

60 days or a fine not exceeding $1,000.