For schedule 4 of the Act , definition
"personal mobility device" , paragraph (b) , a vehicle is a
personal mobility device if the vehicle—
(a) has 1 or more wheels; and
(b) is propelled by an electric motor; and
(c) is not more than—(i) 1,250mm in length by 700mm in width by 1,350mm in height; or(ii) 700mm in length by 1,250mm in width by 1,350mm in height; and
(d) weighs 60kg or less when the vehicle is not carrying a person or other load; and
(e) is none of the following—(i) a low powered toy scooter;(ii) a motorised mobility device;(iii) a vehicle with pedals.