the other person merging into your lane. it is the person's responsibility to merge safely with traffic. they need to be going faster then the people already there. you being on the road gives you the right way. i see this all the time. most people think that you should move over for them. no. wrong. they need to step on the gas OS step on the brakes.
the car backing out.
If you are pulling out and hit the other car.....you are. Person in the lane has the right of way.
the car changing lanes, so the left. By Yisoonshin - "I thought that the car on the right would be at fault, because since the left lane is merging, the right car should go faster or slower to allow room for the car in the left lane. It's not like you can stop right there. But usually the right lane merges into the left, or at least I thought they do. By Perau - nope, that's not how it works. the car on that lane has the rightaway to go at whatever speed they like. The car on the left has to wait and make sure it is clear for them to merge.
Changing lane should be at fault because the driver should be able to control the car against hitting another car. The changing lane driver only has a case if it is illegal to use the side road.
If you changed lanes and hit a car in the lane you are trying to get into you are at fault.
Assuming the other vehicle was in the right lane - you.
If the left lane is ending, and merging into the right lane, then the car already in the right lane has right of way.
The other driver's fault. He or she should have paid attention.Another View; IT DEPENDS. If you opened the door to a traveled lane and it was struck by passing traffic - YOU are the one at fault.
Situation dependent. If it was a result of you failing to yield right-of-way (the vehicle already occupying the lane of travel has right-of-way over merging vehicles, always), then you would be.
It's difficult to answer with a definite answer, but if you are the one merging, it will almost always be considered your fault.
Sounds like Car #1 is at fault
The car that hit the rock is at fault. If the driver was operating with due caution they would have either seen, or avoided, the rock in the first place, and/or had their vehicle under sufficient control as to prevent it from being deflected from its lane of travel.