1. What a bus and a stop sign send
Smart bus covers dispatch, passenger counts, arrival forecasts, and onboard video. Onboard terminals, card readers, cameras, and electronic stop signs report over 4G. An onboard terminal sends a live GPS position. Arrival time is calculated from stop and route data and pushed to electronic stop signs and the app. Passenger counts can come from IC cards, video, or infrared sensors, supporting OD analysis — origin and destination — and passenger load by route section. Buses move, and 4G is what covers the whole route network. SimtoLink gives bus operators 4G, a shared data pool, VPDN, and an API into the dispatch platform.
2. Dispatch, fares, stop signs, and the camera
A position report, a card tap, and a video clip do not ask the same thing of the link. Dispatch has to know where the bus is now. A complaint recording can upload later.
Dispatch and live location
Onboard terminals send GPS tracks and running status over 4G, for dispatch, departure plans, and an alert when a bus falls off the plan.
Passenger counts and IC cards
Card readers and passenger counters report over 4G, for origin-destination analysis, loads by route section, and capacity planning.
Stop signs and arrival times
Electronic stop signs take arrival data and ad content over 4G, so a waiting passenger sees when the bus is due.
Onboard video
Onboard recorders send video over 4G for security monitoring, a record if a passenger complains, and an incident clip.
3. What the bus link has to do
- The whole route: Buses follow fixed routes and need more than one operator so the network stays covered. Check signal in tunnels, on elevated roads, and in the suburbs.
- Dispatch that cannot wait: Position reports and arrival forecasts need updates by the minute or by the second. A dispatch command has to go out promptly. A dropped link disrupts service.
- Several devices on one bus: A bus may combine an onboard terminal, a card reader, and multi-channel recorders. The link has to carry them together and split data fairly.
- Security: Operations and passenger data touch public safety. A VPDN private network, TLS, and an IP allowlist are required, in line with transport-authority data-security rules.
- The dispatch desk: APIs connect the dispatch platform, the stop-sign system, the passenger-flow platform, and map providers, so arrival forecasts and origin-destination analysis stay in one loop.
4. Which SIM fits which device on the route
An onboard terminal and a recorder do not ask the same thing of the network. The table is a starting point:
| Use | Recommended network | Why it fits |
|---|---|---|
| Onboard terminals, dispatch | 4G | Live location, track reporting, dispatch commands |
| Passenger counts, IC cards | 4G | Low bandwidth, real-time reporting, OD analysis |
| Electronic stop signs | 4G | Arrival data in, ads pushed out, fixed sites |
| Onboard DVR, video | 4G | Video backhaul, security monitoring, medium bandwidth |
5. How much data a bus device uses
One device typically uses about 100–500MB a month, and video is most of it. Dispatch and passenger data alone run about 50–100MB a month; with an onboard recorder that rises to 200–500MB. Pool SIMs by vehicle type, keep 20%–30% spare, and use VPDN to keep the link private.
6. Security and compliance
Treat bus operations and passenger data as high security. A VPDN private network, TLS, and an IP allowlist are required. SimtoLink provides VPDN, a private APN, and completes real-name registration for the SIMs.
7. What SimtoLink would deploy
For onboard terminals, passenger counters, and electronic stop signs, use a 4G IoT SIM. A bus travels the whole route and has to report location and passenger flow as they happen, and a stop sign has to receive the next arrival. SimtoLink plans for 99.9% network availability, multi-operator selection so coverage holds on the move, a shared data pool, and an API into the dispatch platform.
8. Putting a route on the network
Rollout:
Size the plan to the vehicle and the route, and check coverage where the bus actually runs. Set VPDN and the APN, plus an IP allowlist, and alert at 80% of the data allowance. SimtoLink stays with the project from the first line through the fleet. Contact us for a plan built around those routes.