Parking layouts are strategies for efficiently organizing multiple indoor or outdoor parking spaces. Often laid out in parking lots or designed as multi-level parking structures, parking facilities are essential for systematically storing vehicles in public and private settings. Parking parameters differ between countries and governments and each has developed its own standards. For example, parking spaces in the United States are larger on average than parking spaces in Europe. Strategies to consider when laying out parking are the directions of traffic, systems of either one or two-way traffic, the angle of the spaces, the type of vehicles being parked, and the inclusion of pedestrian walkways and landscape elements.