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If it doesn't include a phone number large enough to read from a distance, a clear statement of what you do, and ideally a simple way to find you online, it's likely functioning as decoration rather than as the mobile advertisement it could be.
A vehicle with your business name on it is seen by far more people than almost any other form of advertising a small operator has access to — every red light, every parking lot, every drive past a neighborhood is an impression. Whether that impression converts into a call depends entirely on whether someone who sees it can act on it.
The most common gap: a phone number that's technically present but too small to read from another car, especially at a distance or in motion. If someone has to be right next to your vehicle and squinting to read your number, the vehicle isn't generating calls — it's just identifying the vehicle to people who already know who you are.
What works: a phone number large enough to read from a reasonable distance, a clear, simple statement of what you do (not just a logo or business name if the name doesn't make the service obvious), and ideally a simple, memorable way to find you online — a website address or even just "search [Business Name]" if your Google profile is strong. This is the same underlying principle as everything else — can someone take action on what they're seeing, easily, right now.
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See a sample evaluation →Large enough to read from across a parking lot or from an adjacent lane at a stoplight — if you have to ask whether it's big enough, it probably isn't.
Phone number is usually more immediately actionable for vehicle visibility — a website requires someone to remember it and look it up later, while a phone number can be acted on immediately if visible long enough.
Yes — the same clarity-and-action principles apply across every customer touchpoint, and a vehicle that drives calls connects directly to whether your voicemail and Google profile can handle and convert those calls.