TDCI’s glossary explains how a telemetric device can feed auto insurance rate making.

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By Preston Stewart, All Seasons Insurance Group  ·  October 17, 2026

Usage-based auto programs ask drivers to share how they actually drive. The Tennessee Department of Commerce and Insurance (TDCI) glossary puts a name on the hardware side of that bargain. A Telemetric Device, TDCI says, is “A devices installed on a vehicle that records and transmits data to the insurance company how the vehicle is driven.” The same entry adds: “Data captured includes rapid acceleration, hard braking, etc. This data is used in the rate making process.”

TermWhat TDCI’s glossary says
Telemetric DeviceInstalled on a vehicle; records and transmits how the vehicle is driven
Examples of dataRapid acceleration, hard braking, and similar driving events
How insurers use itIn the rate making process

Source: TDCI Glossary of Insurance Terms. Spelling and wording follow TDCI’s published entry.

Rate making is the point of the plug-in

TDCI’s definition is blunt: the data is used in rate making. That can mean a discount for calm miles, a surcharge for hard braking, or a program that never leaves the voluntary-discount lane. The glossary does not promise a discount. It only explains why the device is on the car.

What to ask before you enroll

Related auto basics

This article is informational only. It does not promise that enrolling in a telemetric or usage-based program will lower your premium. Your policy forms, program terms, and declarations control.

Related reading from All Seasons

Free policy review

All Seasons Insurance Group offers a free personal policy review. Call 865-263-1400 or visit asigtn.com/get-a-quote/. This article is informational only and does not promise coverage or eligibility; your policy forms control. Seasons change. So should your coverage.

What is a telemetric device under TDCI’s glossary?

TDCI describes it as a device installed on a vehicle that records and transmits data to the insurance company about how the vehicle is driven.

What data does it capture?

TDCI says data captured includes rapid acceleration, hard braking, and similar information.

How do insurers use that data?

TDCI says the data is used in the rate making process.

Does plugging in guarantee a discount?

No. TDCI’s definition explains the device and its use in rate making. It does not promise a discount. Program terms control.

Is participation required?

TDCI’s glossary entry does not say. Ask your insurer whether the program is optional and what happens if you decline.

Where do filed rates show up publicly?

TDCI posts monthly auto rate tables, and SERFF Filing Access holds the underlying filings. Related reading links those tools.

Is this a coverage or eligibility promise?

No. This article summarizes TDCI’s glossary definition only.

How can All Seasons help after reading this?

Call 865-263-1400 or visit asigtn.com/get-a-quote/ for a free personal policy review. Informational only; no coverage promises. Seasons change. So should your coverage.

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