To avoid **glare** in the interior rearview mirror, it is useful to **place your hand in front of it**. This is because mirrors are designed to allow the driver to see what is happening behind and to the sides of the vehicle. However, in certain situations, such as when there is intense sunlight or lights from other vehicles, the reflection can be very strong and cause glare.

- **Placing your hand** in front of the interior rearview mirror temporarily blocks the intense light, allowing the driver to maintain good visibility without being blinded by the reflection.
- This action is a quick and effective solution to manage glare without needing to adjust the mirror or make sudden movements that could distract the driver.

Therefore, placing your hand in front of the mirror is a simple and practical measure to improve visibility and safety while driving.