Piétonvignette|50px|Piéton en déplacement. Un piéton est une personne se déplaçant à pied, en marchant ou en courant, par opposition à celui qui utilise un véhicule : il s'agit donc d'un mode de transport dit « doux ». Sa vitesse est de l'ordre du mètre par seconde (soit : de 2,5 à pour un randonneur en condition moyenne et de 4 à en milieu urbain dense). Sur terrain plat, en dessous de 4 km/h, on parlera de marche normale de piéton, de 4 à 5 km/h de marche dynamique, entre 5 et 6 km/h de marche rapide et au-dessus de 6 km/h, de marche sportive.
Passage piétondroite|upright=1.5|vignette|Passage piéton à Burnaby en Colombie-Britannique (Canada). Un passage piéton (parfois appelé passage clouté, malgré la disparition des clous) est une partie de la route, aménagée afin de permettre aux piétons de circuler en sécurité sur la chaussée, généralement pour la traverser. Il est conçu pour maintenir les usagers groupés dans un espace visible par les automobilistes et où ils peuvent circuler ou traverser en toute sécurité vis-à-vis du trafic routier.
Zone piétonnethumb|La rue du Gros-Horloge à Rouen, première voie piétonne de France. thumb|Rue du Petit-Champlain à Québec. Une zone piétonne, zone piétonnière, zone pour piétons, centre piétonnier, plateau piétonnier ou secteur piétonnier d'une ville est un ensemble de rues et de ruelles où la circulation est réservée aux piétons et souvent également aux cyclistes.
Law of demandIn microeconomics, the law of demand is a fundamental principle which states that there is an inverse relationship between price and quantity demanded. In other words, "conditional on all else being equal, as the price of a good increases (↑), quantity demanded will decrease (↓); conversely, as the price of a good decreases (↓), quantity demanded will increase (↑)". Alfred Marshall worded this as: "When we say that a person's demand for anything increases, we mean that he will buy more of it than he would before at the same price, and that he will buy as much of it as before at a higher price".
Marche à piedLa marche est un mode de locomotion naturel chez l'homme. Elle consiste en un déplacement en appui alternatif sur les pieds, en position debout et en ayant toujours au moins un point d'appui en contact avec le sol, sinon il s'agit de course. C'est un des principaux modes de déplacement, qui fait partie des modes dits « fatigants », « doux » ou « actifs », comme des moyens de transport tels que la bicyclette, la trottinette ou le patinage à roulettes, par opposition aux modes de transport motorisés parfois dits « passifs ».
DemandIn economics, demand is the quantity of a good that consumers are willing and able to purchase at various prices during a given time. The relationship between price and quantity demand is also called the demand curve. Demand for a specific item is a function of an item's perceived necessity, price, perceived quality, convenience, available alternatives, purchasers' disposable income and tastes, and many other options. Innumerable factors and circumstances affect a consumer's willingness or to buy a good.
Cross elasticity of demandIn economics, the cross (or cross-price) elasticity of demand measures the effect of changes in the price of one good on the quantity demanded of another good. This reflects the fact that the quantity demanded of good is dependent on not only its own price (price elasticity of demand) but also the price of other "related" good. The cross elasticity of demand is calculated as the ratio between the percentage change of the quantity demanded for a good and the percentage change in the price of another good, ceteris paribus:The sign of the cross elasticity indicates the relationship between two goods.
Pedestrian scrambleA pedestrian scramble, also known as scramble intersection and scramble corner (Canada), 'X' Crossing (UK), diagonal crossing (US), scramble crossing (Japan), exclusive pedestrian interval, or Barnes Dance, is a type of traffic signal movement that temporarily stops all vehicular traffic, thereby allowing pedestrians to cross an intersection in every direction, including diagonally, at the same time. In Canada and the United States, It was first used in the late 1940s, but it later fell out of favor with traffic engineers there, as it increases delay for pedestrians and drivers.
Demand curveIn a demand schedule, a demand curve is a graph depicting the relationship between the price of a certain commodity (the y-axis) and the quantity of that commodity that is demanded at that price (the x-axis). Demand curves can be used either for the price-quantity relationship for an individual consumer (an individual demand curve), or for all consumers in a particular market (a market demand curve). It is generally assumed that demand curves slope down, as shown in the adjacent image.
Price elasticity of demandA good's price elasticity of demand (, PED) is a measure of how sensitive the quantity demanded is to its price. When the price rises, quantity demanded falls for almost any good, but it falls more for some than for others. The price elasticity gives the percentage change in quantity demanded when there is a one percent increase in price, holding everything else constant. If the elasticity is −2, that means a one percent price rise leads to a two percent decline in quantity demanded.
