Fitting a tracker to a vehicle your business owns and your employee drives is, in general terms across the United States, lawful, and the thing that makes it lawful in practice is notice: telling the people who drive that the vehicle records where it goes and what is done with that record. Almost every problem in this area comes from one of four specific situations rather than from tracking as such, and all four are worth deciding before the hardware is ordered rather than after.
The four situations that change the answer
Private use outside working hours, where continuing to record a vehicle an employee is allowed to take home is the most commonly contested case. The driver's own car, where the vehicle is not yours and consent has to be real rather than assumed. Audio recording, which is governed by wiretap rules rather than by vehicle rules and is far more restricted than location. And passengers, where somebody who never agreed to anything is in the cab. Each of these is a policy decision, not a technical setting.
What state variation actually looks like
The pattern that matters is not fifty different rules about fleet tracking. It is that some states restrict placing a tracking device on a vehicle without the owner's consent, that recording audio is a one-party or all-party consent question depending on the state, and that a handful of states regulate employer monitoring or notice specifically. So the practical exposure is concentrated in consent and notice rather than in tracking itself, and a business operating across state lines should write one policy to the strictest standard it operates under.
What to put in writing before the first device is fitted
A short policy that says what is recorded, when recording is on and off, who can see it, how long it is kept, and what it will and will not be used for in a disciplinary process. Then have every driver acknowledge it in writing, and keep the acknowledgements. That document is worth more than any technical control, because almost every dispute here turns on whether the person driving knew, and a signed acknowledgement answers that in one line.
The camera in the same device
Many trackers now ship with a dashcam, often one facing the driver as well as the road, and that is a materially bigger step than location recording. Inward-facing video and any audio raise the consent question sharply, and some providers enable audio by default. Decide whether you want the inward camera at all, whether audio is disabled, and how long footage is kept, before the fleet is fitted. None of this is legal advice: it is the list to take to your own lawyer, and the primary rules are linked below.
Questions people ask about vehicle tracking laws
Is it legal to track a company vehicle?
Generally yes where the business owns the vehicle and the drivers are told. Notice, in writing and acknowledged, is what makes it defensible.
Can we track a vehicle outside working hours?
This is the most contested case, particularly for take-home vehicles. Decide it in the policy and say plainly whether recording pauses outside shift hours.
Do we need consent to record audio?
Audio is governed by wiretap rules rather than vehicle rules and is far more restricted than location. Some providers enable it by default; check and decide deliberately.
What about an employee's own car?
The vehicle is not yours, so consent has to be real and specific rather than assumed from an employment relationship. Take that one to your own lawyer.