When you are driving on a expressway you must remember that the greatest danger on expressways is?

The greatest danger on expressways is often the high speed of vehicles, which can lead to severe accidents if drivers are not vigilant. Additionally, sudden lane changes, tailgating, and merging traffic can create hazardous situations. Drivers must stay alert, maintain a safe following distance, and be aware of their surroundings to minimize risks. Ultimately, a lack of attention or poor decision-making can greatly increase the likelihood of collisions.