How should a driver react when engine failure occurs on the expressway?

When engine failure occurs while driving on the expressway, the safest and most advisable reaction is to pull over to the shoulder. This action helps to avoid creating a hazardous situation for both the driver and other vehicles on the road. By moving to the shoulder, the driver can position the vehicle out of the way of moving traffic, reducing the risk of a collision. It also allows the driver a safe space to assess the problem and call for assistance if needed.

Moving onto the shoulder is crucial as it provides a buffer from potential dangers that come from remaining in a lane of traffic where the vehicle might become a stationary obstacle, increasing the risk of accidents. Additionally, remaining in the lane can make it difficult for other drivers to navigate around the disabled vehicle, leading to congestion or further accidents.

Other responses such as accelerating, staying in the lane of traffic, or opening the hood can create more dangerous situations. Acceleration could worsen control issues and staying in traffic poses a high risk to safety. Opening the hood may be interpreted by other drivers as a signal to stop and help, but it does not ensure safety or effective assistance while the vehicle remains in a potentially dangerous position on the expressway.