Final answer:
The subject of this question is driving. The question discusses various restrictions that apply to driving on a freeway, such as not driving over medians and not making U-turns.
Step-by-step explanation:
The subject of this question is Driving. The question is discussing various restrictions that apply to driving on a freeway, such as not driving over or across any median, not making U-turns, and not changing lanes without signaling. These restrictions are aimed at ensuring the safety of drivers and preventing accidents on the freeway.