Suppose you pull up to an intersection and you want to make a turn, but there's a parking lot next to you that feeds out onto the same street you're trying to turn onto, or you're trying to pull out of a parking lot that is beside another that feeds onto the same street. Basically, if you have two cars that are pretty much side by side, who has the right of way? Who gets to go first?
Interesting question! I believe all of the examples can be addressed by the following rules:
Of course, not enough people know these rules, so in practice if you can't get the vehicle with the legal right-of-way to take it I teach drivers to be as decisive and cautious as possible: I.e., take the right-of-way, but not so fast that you can't avoid the other vehicle if it decides to go after all, because legally you will be at fault in a collision. (Though it's anyone's guess how police and insurers would settle the tricky scenarios you illustrate.)
This answer is correct to the best of my knowledge, but IANAL/TINLA.
Since in all scenarios, neither vehicle is yet on the horizontal road, neither has the right of way. Nor do they share a "common intersection" to which the intersection right of way rules can be applied.
Therefore, the first vehicle to enter the horizontal road will find itself in a position where it is on that road, and the other vehicle is not. At this point, the first rule from feetwet's answer applies, with a very slight modification:
A vehicle on a roadway has the right-of-way over a vehicle not on
a roadwaythat roadway.
In practice, though, the best course of action is to communicate with the other driver (e.g. via hand signals, etc.) and reach an agreement as to who will go first, and then for the other driver to yield to that driver.
The general rule is that when entering a roadway the vehicle entering the roadway should yield to oncoming traffic unless that vehicle is an emergency response vehicle (Fire engine, ambulance, police car) that is responding to an emergency call(IE with lights and sirens going). This is true regardless of if the parking lot is in the middle of a block or adjacent to an intersection. The exception would be if there is some sort of traffic control device in place.
However it is often enforced that if the oncoming vehicle should have been able to reduce speed to avoid a collision with the merging vehicle that oncoming vehicle will often be cited for for failure to reduce speed. This will vary by jurisdiction though.
