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These are categorised as class 3 invalid carriages. They have a maximum speed limit of 4 mph on pavements and 8 mph on roads. They need to be registered with the DVLA, and you must display a 'nil value' tax disc.

Four wheeled power scooters are the culmination of state-of-the-art technology and solid performance. They travel at a speed of 6 mph, on an average. A three wheel power scooter weighs approximately 220 to 250 pounds, and a four wheel power-scooter is around 350 to 400 pounds.

Although mobility devices have been used in some capacity for many centuries (Phillip II, a 6th century Spanish King was reported to have used a type of wheelchair), it is commonly accepted that the first mobility scooter was invented in1968.

Folding mobility scooters are considered personal vehicles and hence cannot support the weight of a passenger. It is very risky to try taking a co-rider with you. Moreover, it is also not legally allowed. For safe riding, check the manuals of the scooter, understand its limitations, and then start using it.

Manual wheelchairs and Class 2 vehicles are those with an upper speed limit of 4 mph (6 km/h) and are designed to be used on pavements. Class 3 vehicles are those with an upper speed limit of 8 mph (12 km/h) and are equipped to be used on the road as well as the pavement.