a new element, popular due their fast growth and distinctive shape. Also in the middle of the 19th century, when the construction of imperial roads continued, but at the same time a network of non-state side roads was created, the law ordered the planting of avenues along them, especially fruit trees and mulberries. Many baroque alleys have aged and been felled, and fruit tree alleys have become increasingly popular. At the time of the development of motoring, the oldest avenues often hinder the widening and modernization of rural roads and are the subject of dispute between conservationists and traffic safety requirements. Design To enhance the approach to mansions or manor houses, avenues were planted along the entrance drive. Sometimes the avenues are in double rows on each side of a road. Trees preferred for avenues were selected for their height and speed of growth, such as poplar, beech, lime, and horse chestnut. In the American antebellum era South, the southern live oak was typically used, because the trees created a beautiful shade canopy. Sometimes tree avenues were designed to direct the eye toward some distinctive architectural building or feature, such as a chapels, gazebos, or architectural follies. Street name Origin Avenue as a street name in French, Spanish (avenida) and other languages implies a large straight street in a city, often created as part of a large scheme of urban planning such as Baron Haussmann's remodelling of Paris or the L'Enfant Plan for Washington D.C.; "avenues" will typically be the main roads. This pattern is very often followed in the United States, indeed all the Americas, but in the United Kingdom this sense is less strong and the name is used more randomly, mostly for suburban streets developed in the 20th century, though Western and Eastern Avenues in London are main traffic arteries out of the city, if not very straight. Cities In cities which have a grid-based naming system, such as the borough of Manhattan in New York City, there may be a convention that the streets called avenues run parallel in one direction – roughly north–south in the case of Manhattan – while "streets" run at 90 degrees to them across the avenues; roughly east–west in Manhattan. In Washington, DC the avenues radiate from the centre running diagonally across the grid of streets, which follows typical French usage of the name (in France "boulevards" are often main roads