The “rolling retest” is a misnomer for the more appropriate designation of “random running retest.” To start the interlock vehicle, a “standing” test (with the vehicle turned off) is required in which both a valid breath sample and dexterity test must be performed prior to turning the key or pressing the start button. Randomly thereafter, the interlock will signal the need for a “running retest” that requires ONLY the provision of a breath sample. The vehicle need not be “rolling,” as it is the option of the driver to determine if it is safe to provide the breath sample while the vehicle is underway (rolling). The driver may opt to stop the vehicle temporarily in a safe location and simply provide the breath sample without performing the dexterity test—so long as the vehicle is not turned off.