Bus Routing Optimization: GPS Signal Priority and Real-Time Load Tracking

Singapore's bus network operates over 350 routes carrying approximately 4 million riders daily. Incremental technology deployments across the fleet are changing how buses interact with traffic infrastructure and how passengers access real-time occupancy information.

Smart Bus Priority System

The Smart Bus Priority System uses GPS trackers fitted to buses to communicate real-time location data to a back-end assessment system. When a bus approaches a signalised junction, the system can extend the green-light duration or shorten the red-light phase, allowing the bus to pass with reduced delay. This adjustment benefits all vehicles traveling in the same direction alongside the bus.

The system was trialled on services 98 and 99 in 2018 as a complementary measure to existing bus priority infrastructure, which includes dedicated bus lanes and B-signal traffic lights at selected junctions. The B-signal gives buses an early start before general traffic, typically 4 to 6 seconds ahead, allowing them to clear the junction before cars begin moving.

SBS Transit Responsive Braking Pilot

Scheduled for mid-2026, SBS Transit will pilot a responsive braking system that transmits live video feeds, precise vehicle locations, and incident details directly to the bus operations control centre. The system is designed to improve reaction times when incidents occur on board or on the road. This data stream allows dispatchers to reroute adjacent buses, notify emergency responders with exact coordinates, and monitor the situation through the onboard camera feed in real time.

Passenger Load Displays

SMRT Buses has deployed information display panels at bus interchanges that show estimated arrival times and current traffic conditions along routes. Onboard panels display estimated arrival times at upcoming stops and the passenger load of the next bus on the same route. This allows commuters at a stop to decide whether to board a crowded bus or wait a few minutes for a less occupied one following behind.

The passenger load data originates from weight sensors on bus suspension systems and fare card tap counts at the front door reader. Both data points are cross-referenced to produce a three-tier occupancy indicator: seats available, standing room, and limited standing.

Network Planning and Route Adjustments

The Land Transport Authority serves as the central planner for Singapore's public bus network. Working with operators SMRT Buses and SBS Transit, LTA designs integrated routes and makes regular adjustments based on changes in travel demand. Route reviews incorporate residential development patterns, MRT station openings, and employment centre relocations to ensure bus services act as effective feeders to the rail network rather than duplicating rail corridors.

When new MRT stations open, bus routes in the area are typically restructured: some are truncated to feed the new station, others rerouted to cover gaps that the train does not serve, and redundant services are merged or withdrawn. This occurred most recently with TEL Stage 4 in June 2024, when several east coast bus routes were modified to connect with the new Thomson-East Coast Line stations.

Autonomous Shuttle Integration in Punggol

Starting April 1, 2026, three autonomous shuttle routes began operating in Punggol, a northern new town with limited direct bus connectivity to the Punggol MRT station. The shuttles, operated by Grab (partnered with WeRide) and ComfortDelGro (partnered with Pony.ai), run fixed 10-12 km routes at speeds of 35-55 km/h. A safety operator is present on board during this initial phase.

The shuttles are equipped with sensor arrays that detect pedestrians, cyclists, and obstacles, displaying this information on in-cabin screens for passenger awareness. Community trials from January to March 2026 covered over 25,000 km of testing and received 99 percent positive feedback from riders. Revenue service at a flat S$4 per ride is planned for mid-2026.