To avoid becoming drowsy on an expressway, there are several steps you can take. Firstly, it is important to keep your windows closed while driving. This helps to reduce noise and distractions from outside, creating a more conducive environment for alertness. Additionally, opening the windows can create a draft that may make you feel drowsier. Secondly, engaging in conversation with a friend or passenger can help keep your mind active and focused. Talking about various topics and sharing stories can help you stay mentally engaged and prevent drowsiness. Lastly, it is advisable to take regular breaks and stop driving every couple of hours. Pulling over at a rest area or gas station allows you to stretch your legs, get some fresh air, and give your mind a break from the monotony of driving. Taking short breaks can help you stay alert and maintain your energy levels throughout the journey. Remember, ensuring your safety and the safety of others on the road is of utmost importance, so it is crucial to take proactive measures to prevent drowsiness while driving on the expressway.