Drivers are using adaptive cruise control (ACC) to speed, according to a new study by the Insurance Institute for Highway Safety.

Researchers say drivers are “substantially” more likely to speed when using ACC or partial automation that combines that feature with lane centering than when not using either technology.

When selecting a speed to “set and forget,” many drivers choose one over the limit, the study found.

“ACC does have some safety benefits, but it’s important to consider how drivers might cancel out these benefits by misusing the system,” said IIHS Statistician Sam Monfort.

“Speed at impact is among the most important factors in whether or not a crash turns out to be fatal.”

ACC is a more advanced version of traditional cruise control that uses sensors to calculate and maintain a preselected following distance from the vehicle ahead, eliminating the need for the driver to repeatedly brake and reset the system. With the addition of lane centering, the vehicle also maintains its position within the travel lane automatically.

Read the study here.