The **reaction time** is the interval that elapses between perceiving a stimulus, such as a red traffic light, and responding to it, for example, by braking the car. Under normal conditions, this time varies between half a second and one second.

Several factors can **increase the reaction time**, that is, make you take longer to respond. Among these factors are **fatigue**, **sleepiness**, and **excessive heat** in the car. When the environment is too hot, the driver may experience fatigue and distractions, which increases the time needed to react to unforeseen situations.

Therefore, if the air conditioning is on and it is too cold, the driver could experience effects similar to those of extreme heat, such as fatigue, which also **increases the reaction time**. It is important to maintain an appropriate temperature inside the vehicle, between 20 and 24 degrees, to avoid these negative effects and ensure safe driving.