Before driving through a tunnel, what is a key consideration for a driver?

When preparing to drive through a tunnel, ensuring there is enough fuel is crucial for several reasons. Tunnels can often be long, and if a vehicle runs out of fuel while inside, it can lead to dangerous situations, including becoming stranded in an enclosed space with limited ventilation. Additionally, if traffic were to stop or if an emergency occurred, having sufficient fuel allows the driver to maintain control of the vehicle and navigate out of potentially hazardous situations.

While adjusting mirrors, checking oil levels, and turning on headlights are also important maintenance tasks and safety considerations, they are not specifically as critical when it comes to the unique environment of a tunnel drive. The possibility of running out of fuel is heightened in tunnels due to their confined nature, making it a priority for any driver before entering one.