There have been police operations recently in Johor Baru to catch Singaporeans who have unpaid traffic fines. The current procedure is not sustainable for Malaysia and also inconveniences Singaporeans.
One issue is Singaporeans do not get a notice of offence until they re-enter Malaysia, which may be long after it occurred. This may lead to disputes; for example, if the car was sold to someone else or is rented.
While both countries are not in a position to integrate their legal systems, it would be good if they can share data, including evidence of offences and details of vehicle ownership, with each other. At the least, the Malaysian traffic police could notify the Land Transport Authority of offences, and the latter can forward the notice to the drivers here.
While the former has no jurisdiction in Singapore, the driver would be reminded that refusal to pay the fine may result in a penalty at the next re-entry. This would build trust between the two countries and reduce complications in the case of second-hand or rental vehicles driven across the border.
Related:
Malaysia Stops SG Cars at Second Link and Forces Drivers to Pay Thousands in 'Unpaid Fines'