This is a common problem that is easily overcome in most companies who are introducing tracking software for the first time. Communicate to your drivers that the tracking software is not being introduced out of mistrust but for the variety of benefits it offers to the business. The better the business does, the better it will be for the employees. There are also direct employee benefits to vehicle tracking, such as less paperwork to fill out and proof of working hours to guarantee they always get the right amount of pay. If your drivers use their vehicles in their downtime too, assure them that they will not be tracked during these hours, or any time that they are unaware (covert tracking is illegal). Many vehicle trackers have a privacy buttons feature for this purpose.