The **reaction time** is the interval that elapses from when we perceive a stimulus, such as a red traffic light, until we respond, for example by pressing the brake. Under normal conditions, this time is usually **between half a second and one second**.

This time can vary depending on several factors, such as the person's **reflexes**, their **physical and psychological condition**, and the **environment** in which they are. Factors such as **fatigue**, **drowsiness**, **advanced age**, **hearing or vision problems**, certain **illnesses**, **alcohol or drug use**, and a **disturbed mood** can increase reaction time. Moreover, conditions such as **excessive heat** in the car or **insufficient attention** to driving can also negatively affect it.

Therefore, in normal situations and without the influence of these factors, the average reaction time at the wheel is indeed **between half a second and one second**.