1. The Standard 4-Camera Layout That Covers a Bus
The layout transit operators converge on: road camera high behind the windshield, door-side camera covering the boarding zone, rear camera above the tail for reversing, and a cabin or blind-side camera depending on the vehicle. Four channels on a 10-inch quad-view monitor (the TM4 configuration) put every zone on one glance — the driver never toggles inputs mid-route. The door-side camera alone pays for the system: boarding-zone incidents are the most frequent and most expensive claim in transit operation.
- CH1 road: windshield, center-high
- CH2 door side: boarding zone coverage
- CH3 rear: reversing + tail incidents
- CH4 cabin or blind side by vehicle type
2. 24V Power: Why Bus Systems Are Different
Coaches and transit buses run 24V electrical systems that cook 12V car cameras — the most common cross-shopping failure. A bus camera system must auto-sense 12/24V (the TM series does, with no converters), draw from an ignition-switched circuit so recording stops with the engine, and tolerate the voltage spikes diesel starters generate. One kit spec'd for 24V covers vans, trucks, buses and shuttles — fleets standardize instead of stocking two product lines.
- 12/24V auto-sensing — no converters
- Ignition-switched recording
- Survives diesel starter spikes
3. Night Vision for Early Routes and Night Service
Bus routes start before dawn and end after dark, so every camera needs full-color night vision — not just the road unit. IR-illuminated or starlight-sensor cameras keep the boarding zone, tail and cabin visible in unlit depots and rural stops. The difference matters for incidents: a gray monochrome clip identifies a jacket; a color clip identifies the jacket, the backpack and the plate behind.
- Full-color night vision on all channels
- Unlit depot and rural stop coverage
- Color identifies more than monochrome
4. Reverse Guidance and the Mirror Problem
Bus reversing causes more incidents per maneuver than any other movement — the tail overhang catches cars, posts and passengers. The system's reverse-trigger switching (full-screen rear camera with guidelines the moment reverse engages) turns the riskiest maneuver into a guided one. Operators who add the rear camera alone report immediate drops in reversing claims.
- Automatic full-screen on reverse
- Guidelines for the tail overhang
- Immediate claim reduction reported
5. Recording Architecture: Evidence the Operator Controls
All four channels loop-record to a 256GB card with G-sensor locking — every incident auto-protected from overwrite. For operators who need remote visibility, adding a 4G unit (P85/M77 class) brings live view and GPS to the dispatch desk over a CMSV6-compatible platform. Storage math: a week of 4-channel operation fits 256GB; format monthly and the system runs for years without touching it.
- 256GB = ~1 week of 4-channel recording
- G-sensor auto-locks incidents
- Optional 4G live view for dispatch