in the United Kingdom
The big rule here, which can be an adjustment for many drivers, is that driving is done on the left side of the road, with passing done on the right. Other driving laws are fairly basic.
Other examples of laws include never turning on a red light, and not blocking a central reservation at a junction, even if you have a green light.
Roundabouts are common on British roads.
Cell phone use while driving is prohibited.
The driver and all passengers must wear seat belts. Horn use is forbidden in urban areas overnight between 23:30 and 7:00.