It shall be lawful for the commissioners of police from time to time, and as occasion shall require, to make regulations for the route to be observed by all carts, carriages, horses, and persons, and for preventing obstruction of the streets and thoroughfares within the metropolitan police district, in all times of public processions, public rejoicings, or illuminations, and also to give directions to the constables for keeping order and for preventing any obstruction of the thoroughfares in the immediate neighbourhood of her Majesty’s palaces and the public offices, the High Court of Parliament, the courts of law and equity, the F1magistrates’ courts, the theatres, and other places of public resort, and in any case when the streets or thoroughfares may be thronged or may be liable to be obstructed.