Uber passengers who are tardy in meeting their drivers will now be charged a wait-time fee, which is pro-rated according to when the passenger finally boards.
Grab has ceased its GrabHitch Inter-Country Service, which was deemed illegal by the Land Transport Authority soon after it was launched a year ago.
GrabHitch is one of several carpooling services to emerge after laws were passed in 2015 to allow drivers to be paid for offering rides within Singapore.
The impact of ride-hailing apps like Uber and Grab extend beyond the disruption of the taxi business, it also caused the rental car population to soar.
Grab currently has another carpooling service - GrabHitch - but it uses a separate group of drivers who ferry others on a not-for-profit basis.
A fatal crash on 25th September, involving an Uber car and a lorry, raises questions about adequate insurance and training of private-hire car drivers.
Uber will track the driving behaviour of its Singapore drivers from today, using a new monitoring function in its popular ride-hailing app.
The new upfront fare system shows users the exact amount they have to pay before they take a ride, replacing the old fare estimate and surge pricing system.
Private car insurance policies limit usage of vehicle to social, domestic, pleasure purposes, and will not cover vehicles used for 'hire or reward'.
The Government will be reviewing private car hire services such as UberX to study if they have been competing unfairly with taxis.