Telematics (Black Box) Insurance: How It Works
Updated Oct 10, 2026 · Hannah Breckett · 5 min read
Usage-based policies reward careful driving with lower premiums. They also record more about you than you might expect.
What this article covers
Telematics insurance uses a device fitted to the car, a plug-in dongle, or a smartphone app to measure how, when, and how much you drive. Insurers use the data to adjust your premium.
It is especially popular with young and new drivers, who face the highest prices.
What is measured
- Speed, compared with local limits
- Acceleration, braking, and cornering
- Time of day, with late-night driving often seen as higher risk
- Total mileage
- Phone use while driving, in some app-based policies
The upsides
Careful drivers can see substantially lower premiums, sometimes with discounts applied at renewal or during the policy. The feedback can also help new drivers build good habits. Some devices help locate a stolen car or alert emergency services after a crash.
The downsides
Poor scores can lead to higher premiums, warnings, or cancellation. Some policies have curfews or mileage caps. Data from the device may be used when assessing a claim. Read the privacy policy to understand who can access the data and how long it is kept.
Is it right for you?
Telematics suits drivers who mostly drive during the day, avoid motorway speeding, and want to cut costs. If you regularly drive late at night for work, or share the car with others whose driving you cannot control, a traditional policy may be better value.
This is general insurance information, not legal, financial, or insurance advice. Coverage depends on your specific policy, insurer, and jurisdiction. Read your policy documents and speak with a licensed insurance agent or broker before making decisions.