CHICAGO — It used to be that fleet managers had little more to handle than tracking mileage and scheduling maintenance. Then came on-board GPS, and now most moderate-to-large size fleets have advanced telematics systems that are able to connect directly into a vehicle’s CAN bus (Controller Area Network bus).  A single CAN bus can talk to as many as 70 electronic control units for various vehicle subsystems including the engine, transmission, the antilock breaking system and ...

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