Messages can be transmitted back and forth through a keyboard and monitor in the truck. If there is going to be a delay due to bad weather, the driver can notify head office. Communication is always available where radios and cell phones can fail in areas of poor transmission. Some of the more sophisticated systems have online maps and road reports. There are other systems whereby the home base can track the location of a vehicle through a messaging service on a cell phone.
Customers can even call the truck on a cell phone or by accessing the tracking software.
I did some research on the internet on vehicle tracking systems and discovered that its use is just not limited to truck fleets. You can have a tracking system installed in your car. By doing this, you can easily discover the location of your car if it's being used with or without permission. The receiver is hidden so a thief cannot immediately find it or even be aware of a tracking system. Aside from tracking car thieves, you can identify the location of a family member who is driving your car.