The Westerners also indirectly effected the city's transformation. They petitioned Mongkut to build roads for their use, first to the Phra Khanong area (to where they planned to relocate but later abandoned the idea), then to serve the waterfront community in Bang Rak. The King obliged, and had Thanon Trong (also known as Hua Lamphong Road and later to become Rama IV Road) constructed in 1857 and Charoen Krung Road in 1862. Si Lom Road soon followed, linking the two. The introduction of land-based transport transformed the city, and Charoen Krung became its main thoroughfare, bringing commerce and spurring development. In the 1890s and 1900s, during the reign of King Chulalongkorn (Rama V, 1868–1910), enterprising businessmen engaged in land development by buying up land and building roads through the area. The resulting Sathon, Surawong, and Si Phraya roads ran roughly parallel to Si Lom, and, together with a few connecting roads between them, have since formed the district's main road network.