1.0 PROBLEM
Consider a visually impaired commuter heading to work: at the bus stop she needs someone to tell her which bus is pulling in; at the MRT station she cannot tell which platform heads toward her terminal; at the shuttle-bus stand she must ask every driver where they are going. A Singapore Management University study found that 79% of legally blind respondents agree the transport system needs to be more inclusive for them to travel efficiently. The system is navigable by sight — the challenge was to make it navigable by sound, automatically.
2.0 SYSTEM DESIGN
The proposal retrofits the transport network with three classes of signaler, all activated by a wearable token carrying a Wi-Fi module, a Bluetooth transmitter/receiver, a GPS module, and an SOS button.
Bus stop signaler (Wi-Fi, Bluetooth, speaker). When a token comes into range, a peer-to-peer connection is established and the speaker announces the stop identity, current time, and services — “Welcome to bus station Blk 101 at International Road! The time now is 12:30 p.m. Buses 795, 102, 46.” Station name and services are fixed at provisioning; the time is synchronized over NTP. Delivery mimics the familiar MRT automatic-announcement voice.
Bus signaler (Wi-Fi, Bluetooth transmitter). When a bus comes within 20 metres of a stop, it connects to the stop’s signaler and transmits its service number, and the stop announces “Bus 46 is arriving.” The announcement fires only when a token is also within range of the stop — no token, no audio clutter.
MRT platform signaler (Wi-Fi, Bluetooth, speaker). Installed above the escalators leading down to platforms: “Welcome to Redhill MRT station. On your left is heading to terminal 2, Tuas Link, and on your right is terminal 1, Pasir Ris.” Elevator speakers give the equivalent orientation for step-free routes.
3.0 SOS FUNCTION
Pressing the token’s SOS button activates the GPS module and transmits the token ID and the holder’s location to the Singapore Association of the Visually Handicapped, so civil servants or volunteers can be dispatched to assist — addressing the emergency scenario where a visually impaired person cannot call for help as easily as others.
4.0 NOTES
This was a concept-stage pitch — no hardware was built. The design deliberately reuses commodity radio modules and existing announcement infrastructure so that the retrofit cost lands on the network operator once, rather than on each commuter. The pitch deck itself carried the accessibility theme through: several passages were set in Grade-2 Braille.
Taken further, the design would need to address audio congestion at busy interchanges (multiple tokens in range simultaneously), token privacy (the P2P handshake should not make holders trackable), and integration with LTA’s existing bus-arrival data feeds rather than a parallel bus-to-stop radio link.