1136                             LAWS OF MARYLAND                        [CH. 671

general plan or with any road [plat] plan adopted or approved by
the Commission as a part of the Commission's said General Plan; for
adequate open spaces for traffic, recreation, light and air; for the
reservation of lands for schools and other public buildings and for
parks, playgrounds, and other public purposes, provided no reserva-
tion of land for traffic, recreation, or for any other public purpose
as herein provided shall continue for longer than three 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 property so reserved for
public use as hereinbefore provided shall be exempt from all State,
County and local taxes during such period; for the conservation of or
production of adequate transportation, water, drainage and sanitary
facilities; for the preservation of the location of, the volume and
flow of water in and other characteristics of natural streams and
other waterways; for the avoidance of population congestion; and for
the avoidance of such scattered or premature subdivision 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 services; or 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; or for other
benefits to the health, comfort, safety or welfare of the present and
future population of the District.

Such regulations may include provisions as to the extent and
manner in which roads shall be graded and improved; curbs, gutters,
and sidewalks shall be built; water, sewer and other utility mains,
piping, connections, and other facilities shall be installed; and 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 com-
pletion of such improvements prior to the approval of the plat, the
Commission may accept a bond with surety to secure to the Commis-
sion the actual construction and installation of such improvements
and installations at a time and according to specifications fixed by or
in accordance with the regulations of the Commission. The Commis-
sion is hereby granted the power to enforce such bond by all appro-
priate legal and equitable remedies.

The Commission may also institute injunction, mandamus, or other
appropriate action or proceeding to compel the actual construction
and installation of such improvements and conservation of such re-
sources at a time and according to specifications fixed by or in ac-
cordance with the regulations, [of the Commission] for such pur-
pose any court of competent jurisdiction is hereby granted jurisdic-
tion to issue restraining orders and temporary or permanent injunc-
tions or mandamus or other appropriate forms of remedy or relief.

Before adoption of [its] the sub-division regulations or any sub-
stantial amendment thereof, a public hearing thereon shall be held
by the [Commission] governing body of the county, thirty days'
notice of the time and place of which shall be given by one publication