common synonym perambulator. Strollers 'Strollers' or 'pushchairs/buggies' (British English), are used for small children up to about three years old in a sitting position facing forward. "Pushchair" was the popularly used term in the UK between its invention and the early 1980s, when a more compact design known as a "buggy" became the trend, popularised by the conveniently collapsible aluminium-framed Maclaren buggy designed and patented by the British aeronautical designer Owen Maclaren in 1965. "Buggy" is the usual term in the UK (sometimes "pushchair"); in American English, buggy usually refers to a four-wheeled vehicle known as a quad or quad bike in the UK. "Stroller" is the usual term in the USA. Newer versions can be configured to carry a baby lying down like a low pram and then be reconfigured to carry the child in the forward-facing position. A variety of twin pushchairs are manufactured, some designed for babies of a similar age (such as twins) and some for those with a small age gap. Triple pushchairs are a fairly recent addition, due to the number of multiple births being on the increase. Safety guidelines for standard pushchairs apply. Most triple buggies have a weight limit of 50 kg and recommended use for children up to the age of 4 years. A travel system is typically a set consisting of a chassis with a detachable baby seat and/or carrycot. Thus a travel system can be switched between a pushchair and a pram. Another benefit of a travel system is that the detached chassis (generally an umbrella closing chassis) when folded will usually be smaller than other types, to transport it in a car trunk or boot. Also, the baby seat will snap into a base meant to stay in an automobile, becoming a car seat. This allows undisturbed movement of the baby into or out of a car and a reduced chance of waking a sleeping baby. Another modern design showcases a stroller that includes the possibility for the lower body to be elongated, thereby transforming the stroller into a kick scooter. Steering occurs by leaning towards either side. Depending on the model, it can be equipped with a foot- and/or handbrake. Speeds up to can be reached. The first stroller of this kind was the so-called "Roller Buggy", developed by industrial designer Valentin Vodev in 2005. In 2012 the manufacturer Quinny became interested in the concept and teamed