Not many types of tracked vehicles
[QUOTE]Well the lines between company vehicle and private vehicle can be blurred.[/QUOTE]
Not really. If the company owns the vehicle, it's a company vehicle. If not, it's not. If some company expects me to use my own vehicle for company business, I won't be having them track me to make sure I don't go through the drive-through for lunch on the way.
Anyway, though, Paul's hit it on the head. The vehicles tracked in the US are:
1) Semis (those are lorries for you). Somewhat just for the "here's where your deliver is" aspect, and somewhat to prevent drivers going off-route to visit girlfriends, relatives, etc.
2) Some other delivery vehicles (UPS for sure.. UPS is a package delivery company.)
3) Taxis, it's easier for dispatch to dispatch a taxi if they know where it is.
In all three cases they are tracked by 1) Delivery company that the semi-drivers work for. 2) UPS 3) The Taxi dispatchers. They aren't fed into some centralized thing, the gov't, etc.
So, whatever you do, don't take this as some for of "well, it's ok to track vehicles then, they do it a lot in the US". We really don't much overall. And these were in fact fought tooth-and-nail... especially the semis, there's still delivery companies that specifically DON'T use GPS because the drivers won't stand for it. (Basically, on the theory that if they get the delivery on time, who cares if they go a few miles off course to spend the night?)
I'm very surprised they do not use some cellular data based system for this -- coverage is getting very good, and location updates shouldn't use much data. "Normal" data plans are $60/month for 5GB, but for business use a business can buy 5GB/month (for instance) and split it up between as many data devices as they want; I expect 5GB would be enough for tracking rather a lot of vehicles. I'd be tempted to use SMS personally, then the phone chip can take care of "store and forwarding" a few messages rather than the device queueing up data for when a data connection opens back up.. plus they may be able to use "unlimited text" plans then.