The number of e-scooters on the UK's roads is set to soar as London prepares to launch a trial of the vehicles in the coming weeks.

They have been hailed as a greener, more sustainable mode of transport that can reduce traffic congestion, but concerns have been raised after trials in other UK cities.

Newcastle has introduced an overnight curfew for e-scooter riders after a spate of drink-driving arrests, with six men due in court on Thursday.

A councillor in Merseyside recently branded the devices "orange death traps" after witnessing people riding them on pavements in Liverpool.

+INFO: Sky News