Raffles's foresight and well-intended efforts to maintain orderliness in the city's growth started to spiral out of control just eight years after the Jackson Plan was drawn up. With no updates and no new plans drawn up by the British, the city soon outgrew itself, and the plan soon proved completely inadequate. When Raffles arrived in 1819, the population numbered about 150. By 1911, this figure had mushroomed to 185,000, resulting in severe overcrowding, particularly in the Chinatown area. The road system, planned for travel by foot and horse carts, also could not handle the exploding traffic, particularly when motorised vehicles came to Singapore en masse in the 1910s. The 842 private cars in 1915 had multiplied to 3,506 by 1920.