It is topped by a bronze quadriga sculptural group with a female charioteer, representing the Province of Brabant personified raising the national flag.

The basic construction was completed with private funding in May of the same year and the arcade was inaugurated by Leopold II on 27 September 1905, just in time for the 75th anniversary of Belgian independence.

The ceiling, whose arches are semi-circular, is made up of stone caissons, decorated for half of them with a laurel wreath, and for the rest with the acronym meaning "The King, and Law, and Liberty!

[1] The pedestal, facing the Avenue de Tervueren/Tervurenlaan, bears the inscription: "This monument was erected in 1905 for the glorification of the independence of Belgium", with the year shown in Roman numerals.

[1] The originally open colonnade was closed at the rear by a wall in 1905, which starting in 1912, was decorated with a 360 m2 (3,900 sq ft) mosaic frieze with the theme The glorification of peaceful and heroic Belgium, by Jean Delville.

Lines 1 and 5 of the Brussels Metro and the Belliard Tunnel from the Rue de la Loi/Wetstraat pass underneath the park, the latter partly in an open section in front of the arch.