Hi,
I am interested in this project. I have experience developing Vehicle Tracking Solutions and Consignment Tracking Applications.
Best is you can take a GPS based tracking device(location of vehicle) that will give you accuracy. If you go for Cell tower calculation the accuracy will be lesser.
Another way of doing is I will provide you with Android application that will send GPS data to server ( i.e. location of driver of your vehicle) and I will provide you with Web based application to see vehicles on Map and reports like overspeed, or distance travelled in a day, etc.
Please feel free to write to me for any clarification. I can assure you that I have pretty good experience developing type of solution you require, and will provide you with the best possible solution at the least price.
Looking forward to hear from you soon.
Thanks & regards,
Ananya Banerjee