---
name: sg-transport
description: "Singapore transport - bus arrival times, MRT service alerts, carpark availability, traffic. Uses LTA DataMall."
metadata: { "openclaw": { "emoji": "🚇" } }
---

# Singapore Transport

Live bus, MRT and traffic data from LTA DataMall.

## Before anything works: a key

Unlike the weather API, LTA needs one. It is free.

1. Register at https://datamall.lta.gov.sg/content/datamall/en/request-for-api.html
2. The AccountKey arrives by email
3. Store it as `LTA_ACCOUNT_KEY` — never paste it into a message or a filename

Every request sends it as the `AccountKey` header.

## What it does

- **Bus arrivals** — next three buses at a stop, with crowding
- **Train alerts** — live disruptions and advisories
- **Carpark availability** — free lots, useful before driving to a mall
- **Travel times** — expressway estimates

## How to run it

```bash
# Next buses at a stop. Bus stop codes are the 5 digits on the pole.
curl -s -H "AccountKey: $LTA_ACCOUNT_KEY" \
  "https://datamall2.mytransport.sg/ltaodataservice/v3/BusArrival?BusStopCode=83139" \
| python3 -c "
import json,sys,datetime
d=json.load(sys.stdin)
now=datetime.datetime.now(datetime.timezone.utc)
for svc in d.get('Services',[]):
    mins=[]
    for k in ('NextBus','NextBus2','NextBus3'):
        t=svc.get(k,{}).get('EstimatedArrival')
        if not t: continue
        eta=datetime.datetime.fromisoformat(t)
        mins.append(max(0,round((eta-now).total_seconds()/60)))
    load={'SEA':'seats','SDA':'standing','LSD':'packed'}.get(svc['NextBus'].get('Load'),'')
    print(f\"Bus {svc['ServiceNo']:5} {', '.join(str(m)+' min' for m in mins) or 'no data':30} {load}\")
"

# Train disruptions right now
curl -s -H "AccountKey: $LTA_ACCOUNT_KEY" \
  "https://datamall2.mytransport.sg/ltaodataservice/TrainServiceAlerts" \
| python3 -c "
import json,sys
d=json.load(sys.stdin)['value']
print('Normal service' if d['Status']==1 else 'DISRUPTION')
for m in d.get('Message',[]): print('-', m['Content'])
"

# Carpark availability, filtered by name
curl -s -H "AccountKey: $LTA_ACCOUNT_KEY" \
  "https://datamall2.mytransport.sg/ltaodataservice/CarParkAvailabilityv2" \
| python3 -c "
import json,sys
want='VIVOCITY'   # change this
for c in json.load(sys.stdin)['value']:
    if want.lower() in c['Development'].lower():
        print(f\"{c['Development']:40} {c['AvailableLots']:5} lots\")
"
```

## Working notes

- **Ask for the bus stop code** rather than guessing from a road name. It is
  printed on the pole and on the app; guessing sends someone to the wrong stop.
- Arrival times come as absolute timestamps; convert to "in N minutes", which is
  what the person actually wants to know.
- Crowding codes: `SEA` seats available · `SDA` standing only · `LSD` limited
  standing. Translate them — the codes mean nothing to a rider.
- Responses cap at 500 records; the carpark and bus-stop lists are paged with
  `?$skip=500`.
- If the key is missing or rejected, say which and point at the registration
  page. Do not silently return nothing.