Drive on the Right Side of the Road
This may seem like an obvious one, but many people take up the whole road by driving in the center. Although you might not see other vehicles, vehicles may appear out of nowhere causing a collision or one or more cars to be driven off the road. All in all, drive on the right side of the road and stay in your lane no matter what... even if you don't see anyone or you're in a remote place.
Drive a Reasonable Speed for the Environment
The given speed limits (80 km/h on highways out of cities | 50 km/h in cities and on side/dirt roads) are way too slow for quick travel, but speeding 300 km/h down the main road in Kavala is absurd. You should drive at a speed you know you can control your vehicle and stay in your lane, and at a speed where you can stop if someone pulls out of a side street. If there is high vehicle traffic or foot traffic (like in Kavala Square), you should never drive at a speed which would cause death to pedestrians or explosions to vehicles.
Yield at Intersections ALWAYS
When you approach a T intersection from the less busy street, always check both ways before entering the road. A combination of this and a speeding driver can cause a deadly crash.
Slow and Pull to the Right when you hear Sirens
Medics and Police are the exception to the speed rule, so they might be traveling dangerously fast. If you hear a siren or see an ambulance or police car with lights on, pull over to the side of the road and slowly decelerate to prevent injury to anybody involved.
Slow or Stop when Approaching Checkpoint Gate
Checkpoint Gates constrict the road to a size where only 1 car may fit. When two speeding vehicles approach Kavala checkpoint where there is a hill reducing visibility, a crash is unavoidable. When slowly approaching the gate, the vehicle leaving the city exits before the vehicle entering the city enters.
These are a few of my universal ideals for courteous driving on Altis Life. Please feel free to leave comments / suggestions concerning courteous driving.