626                              Laws of Maryland                       [Ch. 452

designate, provided that such adoption shall not affect in any manner
the administration of the regulations by the Commission or its
functions under Section 70 hereof. The regulations may provide for
(1) the harmonious development of the district; (2) the co-ordination
of roads within the sub-division with other existing, planned, or
platted roads or with other features of the District or with the Com-
mission's general plan or with any road plan adopted or approved by
the Commission as part of the Commission's general plan; (3) ade-
quate open spaces for traffic, recreation, parks, playgrounds, schools,
light, and air [;] including requirements for , BY DEDICATION
OR OTHERWISE, AND THE dedication to public use or convey-
ance of areas designated for such dedication under the provisions
of zoning regulations relating to average lot size or planned com-
munity subdivision; (4) the reservation of lands for schools and
other public buildings, and for parks, playgrounds, and other
public purposes, provided no reservation of land for traffic,
recreation, or any other public purpose as herein provided shall
continue for longer than three (3) years unless the public authority
charged with making provision for traffic, recreation, school, or other
public facilities shall have acquired the same or shall have instituted
proceedings to acquire the same within such period; and provided
further that such properties so reserved for public use as herein-
before provided shall be exempt from all State, county and local
taxes during such period; (5) the conservation of or production of
adequate transportation, water, drainage, and sanitary facilities;
(6) the preservation of the location of and the volume and flow of
water in and other characteristics of natural streams and other water-
ways; (7) the avoidance of population congestion; (8) the avoidance
of such scattered or premature sub-division of land as would involve
danger or injury to health, safety, or welfare by reason of the lack
of water supply, drainage, transportation, or other public services
or necessitate an excessive expenditure of public funds for the supply
of such service; (9) conformity of resubdivided lots to the character
of lots within the existing sub-division with respect to area, frontage,
and alignment to existing lots and streets; (10) prevention CONTROL
of sub-division or building (except for agricultural or recreational
purposes) in flood plain areas of streams and drainage courses, and on
unsafe land areas; (11) preservation of outstanding natural or cul-
tural features and historic sites or structures; or [(10)] (12) other
benefits to the health, comfort, safety, or welfare of the present and
future population of the Regional District.

(b) The regulations may include provisions as to the extent and
manner in which (1) roads shall be graded and improved; (2) curbs,
gutters, and sidewalks shall be built; (3) water, sewer, and other
utility mains, piping, connections, and other facilities shall be in-
stalled; and (4) trees shall be planted or conserved as a condition
precedent to the approval of a plat. The regulations or practice of
the Commission may provide for the tentative approval of a plat
previous to such improvements and installations; but any such
tentative approval shall not be entered on the plat or entitle the plat
to filing or record. In lieu of the completion of such improvements
prior to the approval of the plat, the Commission or County may
accept a bond with surety to secure [to the Commission] the actual
construction and installation of such improvements and installations
at a time and according to specifications fixed by or in accordance