520 LAWS OF MARYLAND. [CH. 282

Nothing in this sub-title shall be construed to prevent an
owner or operator of such regularly licensed vehicles from
replacing in an emergency such vehicles by a substitute
vehicle in order to maintain the schedule approved as here-
in provided, or in an emergency from operating, tempo-
rarily, reserve vehicles on such routes and schedules, ap-
proved as aforesaid for the public accommodation, in which
event immediate notification shall be given the Commis-
sioner of Motor Vehicles of the number of trucks, license
plate numbers displayed and destination of all such emer-
gency vehicles.

In cases where certificates have been issued to such
motor vehicle owner for more than one route, all motor
vehicles of the same weight, including reserve or substitute
vehicles, which have been registered for use upon either
or any of said routes, may be used interchangeably upon
either or any of said routes.

The operations upon any route may be conducted with
greater frequency than prescribed by the approved sched-
ule without obtaining permission therefor from the Public
Service Commission, provided, however, that the approved
schedule shall be strictly maintained and adhered to, until
changed with the permission of the Public Service Com-
mission. Whenever, in the opinion of the Public Service
Commission, it will be prejudicial to the public welfare
and convenience, to permit operations to be conducted upon
any route with greater frequency than prescribed by the
approved schedule, said Commission may limit this priv-
ilege in whatever manner it may deem proper or deny the
said privilege altogether, either at the time of the issuance
of the permit or at any time thereafter.

Seasonal permits may be granted for a portion of the
year, if, in the judgment of the Public Service Commission,
the granting thereof is deemed essential to the public wel-
fare and convenience, and routes may be changed or aban-
doned, whenever, in the opinion of the Public Service Com-
mission, the welfare and convenience of the public will not
be prejudiced thereby.

In the event any such motor vehicle owner shall fail to
report any information, as above provided, or shall change
or abandon a route or reduce a schedule, without first ob-
taining the permission of the Public Service Commission,
or shall operate with greater frequency than prescribed
by his approved schedule, where the privilege so to do has
been denied or limited, the Public Service Commission may,
after due hearing, upon not less than three days' notice in
writing, to be sent by registered letter to the address given