Rules of the Road and Right-of-Way
Right-of-way is yielded, never taken
At an intersection with no signs or signals, yield to the vehicle on your right. At a four-way stop, the first vehicle to arrive goes first; if two arrive at the same time, the driver on the left yields to the driver on the right. A driver turning left must yield to oncoming traffic, including bicycles and motorcycles. When you enter a road from a driveway, alley, or parking lot, you yield to traffic already on the road.
Pedestrians in a crosswalk - marked or unmarked - have the right-of-way, and you must not pass a vehicle that has stopped at a crosswalk. Emergency vehicles with lights and siren on: pull to the right and stop until they pass. School buses with red lights flashing require you to stop on an undivided road; on a divided highway with four or more lanes, traffic coming the other way does not have to stop, but stay alert for children.
Lanes, passing, and speed
Keep right except to pass; slower traffic belongs in the right lane. Pass on the left, but you may pass on the right when the vehicle ahead is turning left and there is room. In a roundabout, yield to traffic already circulating, enter to the right, and never stop inside the circle. Speed limits are maximums for ideal conditions - the basic speed law requires a speed that is reasonable and prudent for weather, traffic, and visibility.
Worked example: You and another car reach a four-way stop at the same moment, and the other car is on your right. You yield and let it go first, even if you think you were a fraction of a second earlier.
Trap: green does not equal an absolute right-of-way; pedestrians and clearing vehicles still come first.