Drivers with ride-sharing firms say there has been an increase in the number of foreign-registered cars being used for private-hire or taxi services here, with many spotted picking up passengers at Changi Airport.

The Land Transport Authority (LTA) said it has "stepped up checks" on the illegal activity in recent months. It added that 11 drivers of foreign-registered cars were caught in the first 11 months of this year, but the final number to face penalties will depend on ongoing investigations.