The personal mobility devices and two power-assisted bicycles were taken from 18 retailers in an enforcement blitz conducted along with Traffic Police against errant businesses, which sell vehicles that do not comply with the rules. In a statement on Tuesday, the Land Transport Authority (LTA) said five retailers were found either displaying or advertising non-compliant devices - an offence, which attracts a fine of up to $1,000, jail time of up to three months, or both.

"It is also an offence for a retailer to sell non-compliant devices or modify any device belonging to a customer to a non-compliant state for use on public paths or roads," an LTA spokesman said, adding that first-time offenders can be fined up to $5,000, face imprisonment of up to three months, or both.

The LTA said five retailers were also caught for failing to display its prescribed warning notice. Retailers of such devices are required to display warning notices on their premises stating, among other things, the technical criteria for different devices and where they are allowed to be used.