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May 30, 2023 - 2 min read

Speedometer

What is a speedomter? A speedometer is a vital instrument found in your vehicle that displays your current speed. It provides you with real-time information necessary for safe driving and adhering to speed limits.

Speedometers come in two main types: analog and digital. Analog speedometers use a needle on a circular dial, while digital speedometers show your speed as numerical digits on a screen.

A mechanical speedometer works by rotational motion - a cable connects the rotating wheels to the speedometer, which moves a needle or pointer across a dial indicating your speed in units like kilometers or miles per hour (km/h or mph).

Electronic speedometers use sensors placed on the transmission or one of the wheels to measure rotational speed. That motion is then converted into electrical signals, which are processed by your vehicle's computer and displayed on the dashboard.

The speedometer plays an important role in promoting safe driving habits by enabling you to monitor and adjust your speed accordingly. It is an essential tool to help you maintain control, prevent accidents, and comply with speed regulations.

Speaking of regulations, if you want to rid yourself of all worries related to mileage reporting and tax compliance, the Driversnote Mileage Tracker might be the tool for you. 

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FAQ about speedometers

Speedometers are designed to be relatively accurate, but may have a slight margin of error. Manufacturers calibrate speedometers to display a slightly higher speed than the actual speed to ensure drivers do not unknowingly exceed speed limits. However, factors such as tire size, tire pressure, and wear can affect the accuracy of a speedometer. You can do a comparison with a GPS device to gain insights into your particular speedometer.
Yes, a speedometer can show the wrong speed. Manufacturers often calibrate them to overshoot a little bit, as that is preferable to it showing a lower speed than the vehicle is actually traveling. Apart from that, the calibration is probably not as accurate after years of use, as it was when it left the factory.

How to automate your mileage logbook

Manually filling out your logbook can get tedious - see how to automatically track trips for your mileage reimbursement or deductions.
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